单选题Lifting capacities of derricks vary from three to ten tons. （）A吊杆的起吊能力为三至十吨不等B克令吊的起吊能力为三至十吨不等C他们每24个小时值两次班D起重机的起吊能力为为三至十吨不等
单选题
Lifting capacities of derricks vary from three to ten tons. （）
A
吊杆的起吊能力为三至十吨不等
B
克令吊的起吊能力为三至十吨不等
C
他们每24个小时值两次班
D
起重机的起吊能力为为三至十吨不等
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