题目内容

A high temperature alarm or （） which will melt is used to guard against the explosion of compressor air pipelines.

A. a flame trap
B. a relief valve
C. a fusible plug
D. a bursting ca

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60KG12号提速道岔尖轨锁闭柱与锁闭杆缺口间隙第一牵引点为（）mm；第二牵引点为4±1.5mm。

A. 2±0.5
B. 2±1
C. 1.5±0.5

每班运送人员前，或停止运行（）h以上再次运送人员前，信号把钩工必须做好相关检查。

A. 4
B. 5
C. 6
D. 7

风险分类为次级、可疑和损失类授信后检查频率视具体情况而定，但不应少于6个月一次。

A. 正确
B. 错误

He was asked to speak louder（）all the students in the classroom could hear him.

A. as
B. so as to
C. so that
D. tha