现代超长行程二冲程柴油机的气缸油所选用的SAE粘度等级与TBN大是

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问题单项选择题

现代超长行程二冲程柴油机的气缸油所选用的SAE粘度等级与TBN大是（）。

A.SAE40，TBN40

B.SAE40，TBN70

C.SAE50，TBN40

D.SAE50，TBN70

答案

参考答案：D

选择题

The old man said the accident ________ careless driving, so a lot of money ________ be paid by the

driver.[ ]

A. was due to; was due to

B. due to; was due to

C. is due to; has due to

D. is due to; was due to

问答题简答题

涡流探头安装应注意哪些问题？