pH=11.02中,此数值的有效数字为()位
A.1
B.2
C.3
D.4
参考答案:B
这个标志提示哪种车型禁止通行?()
A.中型客车
B.小型货车
C.各种车辆
D.小型客车
More and more high-rise buildings have been built in big cities()space.
A. in search of
B. in place of
C. for lack of
D. for fear of