所有磁铁都至少有()个磁极.
A.1
B.2
C.3
D.4
参考答案:B
The young man who just graduated from college stays at home all day long, . [ ]
A. and sat around
B. sat around
C. sitting around
D. and sitting around
小儿巨大肾积水的定义是指()
A.肾积水容量超过300ml
B.超过24小时尿液总量的肾脏积水
C.导致肾实质显著破坏、肾功能严重丧失的。肾积水
D.肾脏体积巨大,体表能扪及巨大包块
E.肾积水容量超过800ml