从
轴进入教室的风道底标高应为 ( )。
A.3.600
B.3.400
C.3.300
D.2.900
参考答案:A
Her opinions are different _______mine, so I ciisagree _______ her. [ ]
A. of, on
B. from, on
C. of, with
D. from, with
元素周期表中有()个主族。
A.7
B.18
C.16
D.8