题目内容

It is necessary for technicians ______ one or two foreign languages．

A. master
B. to master
C. mastering
D. mastered

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油脂性基质栓应在多少分钟内全部融化、软化，或触压时无硬心( )

A. 40
B. 20
C. 30
D. 10
E. 60

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A. adventure
B. risk
C. threaten
D. venture

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A. closer for
B. included
C. starred
D. named

The company recommended that a new petrol station be built here.

A. demanded
B. suggested
C. insisted
D. ordered