He is not (qualification) ________to teach young children.
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He had a good (occupation ) _______________ and occupies an office on his own.
The shop (specialized) _____________ in mountain-climbing gear.
The heart disease has been one of the (fatal) _____________diseases to endanger the health and result in death.
代号为30212的滚动轴承内径宽度系列代号是()
A. 0
B. 1
C. 2
D. 3