A <img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251122/23425118_0.png"> B <img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251122/23425118_0_1.png"> C <img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251122/23425118_0_2.png"> D <img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251122/23425118_0_3.png">

A <img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251122/23425119_0.png"> B <img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251122/23425119_0_1.png"> C <img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251122/23425119_0_2.png"> D <img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251122/23425119_0_3.png">

A <img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251122/23425121_0_1.png"> B <img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251122/23425121_0_2.png"> C <img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251122/23425121_0_3.png"> D <img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251122/23425121_0_4.png">

A 设置消声器降低管道传播噪声 B 通过对工厂车间墙面铺设吸声材料降低直达声 C 外墙墙体计权隔声量从50dB增加至55dB D 隔振设计上，将系统固有频率设计成设备频率接近，共振消耗能量

A 1 B －1 C 2 D －2

A 直角焊缝 B 塞焊缝 C 全熔透焊缝 D 部分熔透焊缝

A <img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251122/23425132_0.png"> B <img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251122/23425132_0_1.png"> C <img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251122/23425132_0_2.png"> D <img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251122/23425132_0_3.png">

A <img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251122/23425116_0_1.png"> B <img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251122/23425116_0_2.png"> C <img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251122/23425116_0_3.png"> D <img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251122/23425116_0_4.png">

A <img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251122/23425117_0.png"> B <img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251122/23425117_0_1.png"> C <img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251122/23425117_0_2.png"> D <img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251122/23425117_0_3.png">

A 蒸压灰砂普通砖 B 实心砖 C 混凝土 D 石材