The disadvantage(s) of using web lashing on light vehicles aboard Ro-Ro vessels is that it().
A. deteriorates in sunlight
B. cuts on sharp edges
C. is vulnerable to damage and pilferage
D. All of the above
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Which of the listed devices would be installed at a control system air pressure reducing station?()
A. Moisture separator
B. Vacuum breaker
C. Lubricator
D. Non-return valve
休克时胃肠粘膜较早处于缺血缺氧状态,因此,胃肠粘膜内PH(PHi)可能发现()。
三相交流电L1、L2、L3的相色依次是()
A. 黄绿红
B. 绿红黄
C. 红绿黄
D. 红黄绿