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【单选题】
在继电器接触器控制电路中，自锁环节的功能是：（）A.
保证可靠停车
B.
保证起动后持续运行
C.
兼有点动功能
D.
保证安全启动
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反馈参考答案：
举一反三
【简答题】桥式起重机的主要技术参数有（）、（）、（）、（）、（）、（）。
【单选题】So involved in his business _________ that he can hardly accompany his wife and child at weekends. [ ]
A.
the manager has become
B.
becomes the manager
C.
has become the manager
D.
has the manager become
【简答题】桥式起重机的主要技术参数有（）、（）、（）、（）、（）和（）等六项。
【单选题】His heart was ______ so violently that he could hardly catch his breath.
A.
bouncing
B.
beating
C.
jumping
D.
punching
【简答题】桥式吊钩起重机的主要技术参数有哪些？
【单选题】Greatly moved by her words, __________.
A.
tears came to his eyes
B.
he could hardly hold back his tears
C.
tears could hardly be held back
D.
his eyes were filled with tears
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