单项选择题

Which of the following is not a part of the chassis？( )

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单项选择题

As our graying society falls _____ to an increasing number of chronic illnesses, we need a health paradigm that solves problems and provides affordable, effective health care for all.
A、victim
B、candidate
C、coverage
D、exposure

单项选择题

固体表面凹凸不平，因此两个固体表面接触时总是存在缝隙。这种说法 A对；B错；C不完全对；D不能确定。