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【多选题】
下列关于圈梁，说法正确的是（）。A.
一般情况下，圈梁必须封闭。
B.
过梁可以兼做圈梁。
C.
圈梁可以兼做过梁。
D.
当门窗洞口时，需增设附加圈梁。
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反馈参考答案：
举一反三
【单选题】With the rapid economic growth in China, the logistics industry is ()greatly
A.
expanding
B.
exploring
C.
exploding
【单选题】During the expansion stroke, the piston is moving .
A.
inwards
B.
outwards
C.
downwards
D.
upwards
【单选题】_______ the company is not as successful as other big companies, it' s proven it can expand internationally.
A.
Even though
B.
If
C.
Yet
D.
As though
【判断题】It is considered inefficient to use concept tests during the idea screening stage of the new-product development process.
A.
正确
B.
错误
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