一级加氢转化器内部装有瓷球的目的是()。
A、催化作用
B、支撑催化剂
C、脱除硫化氢
D、降低阻力
参考答案:B
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According to a recent report, India is considering ______ the cheapest laptop computer which can be afforded by most of the people.
A.to produce
B.producing
C.to be producing
D.it produced
白天化妆时,为避免过浓,应该用()光线来化妆。
A.白光灯
B.黄光灯
C.靠近窗前的天然光线
D.蓝灯光