问题
选择题
Germs can get_______ our body _____the mouth.[ ]
A. on, through
B. through, into
C. into, through
答案
答案：C
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Germs can get_______ our body _____the mouth.[ ]
A. on, through
B. through, into
C. into, through
答案：C
，在第一卦限内求作该曲面的一个切平面，使得切平面与三个坐标平面围成的四面体的体积最小，并求出四面体的体积.