When comparing different fuels for different engines, the ig

【名词&注释】

自然界(nature)、两性花(hermaphrodite flower)、自花传粉(self pollination)

[单选题]When comparing different fuels for different engines, the ignition quality of diesel fuel oils becomes a less critical consideration as （）

A. the amount of lube oil additives increase
B. piston speeds increase
C. injection pressure decrease
D. engine speeds decrease

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学习资料：

[单选题]自然界中，自花传粉的花不一定是（）。

A. A．两性花
B. B．自交亲和
C. C．雌雄同熟
D. D．闭花传粉

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