The securing of passenger cars on a Ro-Ro vessel requires（）.
A. simple and lightweight equipment
B. low labor intensive equipment
C. specially designed equipment to avoid vehicle damage
D. All of the above
Badly leaking refrigeration compressor discharge valves will cause（）.
A. overfeeding of the expansion valve
B. damage to the condenser
C. constant running of the compressor
D. flooding of the receiver
擅自在城市街道两侧和公共场地搭建临时设施的，市容环卫管理部门（）。
A. 责令停止违法行为
B. 限期拆除
C. 罚款
D. 吊销营业执照
线路试运转只能使用装有冷钢锭、钢坯等普通货物的车辆，可以牵引运行。
A. 正确
B. 错误
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