在常温、常压下,1体积水大约能溶解()体积的SO2。
A.1
B.10
C.20
D.40
参考答案:D
公称直径为14-20的螺纹钢,它的重量负偏差按判定文件应该控制在()。
A.0~-7
B.0~-5
C.0~-4
D.0~-3
The objective of the ASTP (Army Specialized Training Programme) was to attain ______ proficiency in a variety of foreign languages.