According to the professor, why do Diana and Campbell monkeys NOT fight?
A.Both species live in the same area in Africa.
B.The Diana monkeys are too small to attack other species.
C.The two groups are not in competition for food.
D.Campbell monkeys are more likely to attack putty-nosed monkeys.
第2题
经常检查减速箱体发热的情况,特别是轴承处,温度不得超过()。
A.100℃
B.80℃
C.50℃
第6题
A.40;50
B. 50;60
C. 60;70
D. 70;80
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