ISO9000族标准自发布后至今已有()国家和地区采用了这套标准。
A. 100多个
B. 50多个
C. 200多个
D. 250多个
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在选择晶体三极管时,通常要求选用管子的穿透电流()越好。
A. 越大
B. 越小
C. 无穷大为好
D. 为零为好
A wildcat ia a().
A. deeply-grooved drum on the windlass with sprockets with engage the links of the anchor chain
B. winch that running out of control due to a failure of the overspeed trips
C. line that has jumped off the gypsyhead while under strain
D. nylon line that parts under strain and whips back in a manner
下列鱼类属于草食性鱼类的是()。
A. 青鱼
B. 草鱼
C. 鲢鱼
D. 鳙鱼