A.Less than ten minutes.B.Half an hour.C.About twenty minutes.D
A. Less than ten minutes.
B. Half an hour.
C. About twenty minutes.
D. Forty-five minutes.
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在塑料管道的类型中，（）具有较高的强度，韧性好、无毒、易燃、热胀系数大、价格高等特点。
A. 铝塑复合管
B. 丁烯管(PB管)
C. 氯化聚氯乙烯(PVC-C)管
D. 硬聚氯乙烯(PVC-U)管
A.reinedB.poweredC.reignedD.controlled
A. reined
B. powered
C. reigned
D. controlled
A.shockB.strokeC.knockD.shot
A. shock
B. stroke
C. knock
D. shot
Employees are anxious about themselves because _________
A. they cannot earn as much as they have expected before
B. they have to always compete with others for a better position
C. they cannot obtain spiritual satisfaction as a human being
D. they are always confronted with fundamental problems of life
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