单选题The SWL of the derricks are different from 5 tons to 10 tons.（）A吊杆的安全工作负荷从5吨到10吨不等。B安全规则规定，吊杆是5吨和10吨。C吊杆自身的重量从5吨到10吨不等。D起重机的安全工作负荷从5吨到10吨不等。
单选题
The SWL of the derricks are different from 5 tons to 10 tons.（）
A
吊杆的安全工作负荷从5吨到10吨不等。
B
安全规则规定，吊杆是5吨和10吨。
C
吊杆自身的重量从5吨到10吨不等。
D
起重机的安全工作负荷从5吨到10吨不等。
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