钻眼工必须认真学习作业规程，熟悉工作面的炮眼布置，爆破说明书、支护方式等有关技术规定；掌握钻眼机具的结构、性能和使用方法；钻眼机具在工作过程中出现故障时，应能立即（）。
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YJl7卷烟机布带轮的线速度和布带轮本身的（）有关。
The maneuvering information required to be posted in the wheelhouse must be based on certain conditions.Which of the following is NOT one of these conditions?（）
A. The hull must be clean
B. There must be calm weather – wind 10 knots or less and a calm sea
C. There must be no currents
D. The depth of the water must be at least one and one-half times the draft
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