边长为()的洞口,可采用贯穿于混凝土板内的钢筋构成防护网,钢筋网间距不得大于20cm。
A. 150cm以上
B. 50-150cm
C. 50cm以下
D. 25cm
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You can try this pressure relief plan by changes in diet and habits.
A. removal
B. cure
C. treatment
D. reduction
防护栏杆能够经受的外力值是()N
A. 500
B. 1000
C. 1500
Many economists pointed out the fatal error for this crisis.
A. crucial
B. puzzling
C. attractive
D. exciting
The conclusion can be deduced from these data.
A. research
B. result
C. cause
D. process