单选题ISO规定润滑油40℃时,粘度共分()级。A运动粘度,18B运动粘度,7C恩氏粘度,7D雷氏粘度,18
单选题
ISO规定润滑油40℃时,粘度共分()级。
A
运动粘度,18
B
运动粘度,7
C
恩氏粘度,7
D
雷氏粘度,18
参考解析
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