成人男性体液总量占体重的()。
A.45%
B.50%
C.55%
D.60%
E.65%
参考答案:D
—Excuse me, but can you help me to repair my MP5 ?
—Why not _______ your knowledge of physics _______ practice?[ ]
A. use; to
B. put; in
C. apply; to
D. apply; for
在螺纹联接中,被联接上应加工出凸台或沉头座,这主要是为了()。