皮皮学，免费搜题
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搜题
【单选题】
The steam coils in a high pressure evaporator used for saltwater service should be de-scaled with _____.A.
a needle gun
B.
soap and water
C.
a wire brush
D.
a chipping hammer
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参考解析：
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皮皮学刷刷变学霸
举一反三
【单选题】When invited for a dinner, start eating when:
A.
food is served.
B.
any one starts eating.
C.
any time you like.
D.
guest of honor starts.