孔隙率越大,材料强度越()。
A.高
B.低
C.不影响
参考答案:B
The English text is very easy because there are only _______ new words in it.
A.a few
B.few
C.a little
D.little
在配制稀硫酸溶液时,应将少量()缓缓倒入()中,并不断进行()