为增加盆土的透气性,一般在盆中掺和()。
A、黏土
B、细沙
C、膨化珍珠岩
D、过磷酸钙
参考答案:C
So far, the moon is the only one of the heavenly bodies in space ______ reached by manned spaceships.
A.that has been
B.what have been
C.which has been
D.that have been
若某C语句如下: struct ex int x;float y;char z;example; 则以下叙述中不正确的是 (29) 。