头围的测量在2岁以内最有价值。()
参考答案:对
The young dancers looked so beautiful in their new clothes that we took ________ pictures of them.[ ]
A. many of
B. masses of
C. the number of
D. a large amount of
用石墨和黄油浸透的棉织调料适合低压水泵上,输送介质在()℃以下。
A.30
B.35
C.40
D.45