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【单选题】

The burning of fuel oil in a diesel engine having a high sodium content, will cause _.

A.
corrosion and grooving of exhaust valves
B.
corrosion and gumming of the fuel injection pump
C.
salt deposits in the exhaust manifold
D.
slag deposits in the fuel injection equipment
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参考解析:
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【单选题】小儿乳牙总数的推算方法是

A.
月龄减5-8
B.
月龄减2-3
C.
月龄减4-6
D.
月龄减8-9
E.
月龄减1

【单选题】小儿乳牙总数的推算方法是

A.
月龄减4-6
B.
月龄减2-3
C.
月龄减4-8
D.
月龄减8
E.
月龄减1