机械弯曲破坏负荷试验,施加负荷时,在规定的弯曲破坏负荷()以前,应迅速平稳地(15s~45s时间内)增加负荷。
A.20%
B.30%
C.40%
D.50%
参考答案:D
Android平台的三个特点是:()
A.丽音二代
B.免费应用无限扩展
C.个性界面自由定制
D.丰富的无限互联网应用
—This wall of air is an effective answer to the problem and it ______ work. —But it is a question to put such a wall of air around the statue.
A. may B. mustC. should D. could