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【多选题】
压力容器受压部件在使用中由于各种原因产生裂纹被迫（）进行（）的称为裂纹事故。例如某厂一只ф2000×15000mm，厚度为18mm的液氨储罐，最高工作压力为1.6MpA，使用中发现有穿透性裂纹而漏氨，但由于修理不当，以致在修理后仅半个月就发生了爆炸。A.
停车
B.
运行
C.
维修
D.
设计
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举一反三
【单选题】Your grandfather is rather tired so do not ______ your visit.
A.
postpone
B.
lengthen
C.
delay
D.
prolong
【单选题】—Your grandfather is always full of .What’s the secret? —Playing Taiji every morning.
A.
taste
B.
energy
C.
relief
D.
credit
【简答题】—Your grandfather is always full of( ).Do you know the secret?一Well,he takes exercise every morning and keeps healthy diets.A. force B. power C. strength D. energy
【简答题】概率论的研究对象是(),研究目的是(),研究方法是()
【单选题】Trying to explain rock music to your grandfather is just like dui niu tan qin ( 对 牛 弹琴 )-playing violin to a bull. The corresponding English expression is .
A.
casting pearls before swine
B.
casting diamonds to a dog
C.
throwing pearls to a pig
D.
throwing diamonds to a goat
【简答题】Be quiet, please! Your grandfather is _________(sleep) in the bedroom.
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