单选题Top the derrick, please.（）A请摆动吊杆B请放低吊杆C请调高吊杆D请移动吊杆
单选题
Top the derrick, please.（）
A
请摆动吊杆
B
请放低吊杆
C
请调高吊杆
D
请移动吊杆
参考解析
解析：
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