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美洲幼虫腐臭病（烂子病）防治方法。

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在用履带吊起吊满载重物时，要先吊离地面（）mm，检查机械的稳定性、制动器的可靠性、钢丝绳绑扎的牢固程度。

A. 150
B. 200
C. 300
D. 400

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食管癌恶性程度最高的是髓质型

A. 正确
B. 错误

We would appreciate it very much if you could make arrangements before September 15 to charter a ship（）the terms mentioned in your yesterday’s telex.

A. according
B. as
C. on
D. at