题目内容

下列不是压力铸造优点的是（）

A. 铸件精度高
B. 强度和硬度高
C. 生产率高
D. 经济性好

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下列哪一项不属于铸造加工的工艺范畴（）。

A. 合箱
B. 落砂
C. 烘干
D. 切割

If you ____ smoking and drinking, your health will improve.

A. gave up
B. give up
C. had given up
D. will give up

Turn on the television or open a magazine and you ____ advertisements showing happy, balanced families.

A. are often seeing
B. have often seen
C. often saw
D. will often see

Years ago we didn’t know this, but recent science ____ that people who don’t sleep well soon get ill.

A. showed
B. has shown
C. will show
D. is showing