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【多选题】
钢结构的连接方式有：（）。A.
焊接连接
B.
螺栓连接
C.
铆钉连接
D.
化学物质粘接
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举一反三
【单选题】It is revealed by research that it is more beneficial to kids if their parents watch TV programs with them than having their viewing time limited.
A.
Y
B.
N
C.
NG
【单选题】The research is so designed that once _____ nothing can be done to change it.
A.
begins
B.
having begun
C.
beginning
D.
begun
【单选题】Cancer Research Campaign is most likely a ______.
A.
medical journal
B.
research institute
C.
private company
D.
governmental agency
【单选题】The research is so designed that, once _______, nothing can be done to change it.
A.
begins
B.
having begun
C.
begun
D.
Beginning
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