单项选择题

在下图中，4号元件是（）。

A、液压泵
B、溢流阀 C
C、液压缸
D、节流阀

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According to Frank O'donnell, the effect of the enforcement of the Clean Air Act could ______.A.exceed Mr. Obama's economic budget greatlyB.be overestimated by some environmental groupC.hetp U. S. government get closer to its climate goalD.solve the climate problem on greenhouse gases

A.A.exceed
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What is the author's attitude toward online education?A.Definitely opposeD.B.Strongly doubteD.C.Completely welcomeD.Reasonably accepteD.

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