按水文循环的规模和过程不同，水文循环可分为（）循环和（）循环。
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All items such as steam pipes, exhaust pipes and fittings which, because of their location and operating temperature, present a hazard should be adequately lagged.That means the items should（）
A. not be put into operation too early
B. be pay adequate attention to
C. be used only when necessary
D. be coated with certain material
当婴儿眼睛（）时，可指导婴儿先微闭眼睛。
A. 有异物
B. 有损伤时
C. 有化学溶液时
D. 疲劳感时
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