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【判断题】
滑动轴承一般都制成整体式。A.
正确
B.
错误
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举一反三
【单选题】Grey whales have long been __________ in the north Atlantic and hunting was an important cause for that.
A.
deprived
B.
extinct
C.
detained
D.
extinguished
【简答题】热轧钢筋是低碳钢或普通低合金钢在______轧制而成。按照其强度的高低，分为______、______、______等几种，在图纸与计算书中分别用符号______、______及______表示，其中______钢筋为光圆钢筋，其余的为带肋钢筋。
【简答题】Every year thousands of grey whales make the longest migration of any animal, traveling 7,000 miles each way between the Arctic and Baja, California. The grey whales spend the long summer days in thei...
【单选题】Many species of whales will not breed unless ______.
A.
they are in the same group for a long term
B.
they are isolated from other species
C.
they are in the company of many other whales
D.
there are enough genes available
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