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【单选题】
某同学用CaCO3为基准物质标定EDTA溶液的浓度,消耗体积为20-40毫升,其正确表达EDTA标准溶液准确浓度的是A.
0.02mol/L
B.
0.020 mol/L
C.
0.02000 mol/L
D.
0.0200 mol/L
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【简答题】水分对植物生长有什么作用?
【单选题】听力原文：W: I hear you're joining that expedition across Alaska. Did you get much funding for it? M: You must be joking! I have to pay my own airfare and contribute toward the cost of supplies. Q: What do...
A.
It'll cost him a lot of money.
B.
He isn't serious about going.
C.
Other people paid for his airfare.
D.
It isn't fair for him to go alone.
【单选题】—I want to tell you something. —You what? I can't hear you're saying.
A.
why
B.
what
C.
that
D.
where
【简答题】土壤水分有哪些?其中哪些水分对植物的生长发育有重要作用?
【单选题】为研究两种植物激素对某禾谷类植物生长的影响,将其幼苗分别置于不同条件下培养,一段时间后,观察并测定株高变化,结果如下表。下列分析错误的是 A .0.5g·L-1的生长素对该禾谷类植物生长有抑制作用 B .0.1mg·L-1的油菜素对该禾谷类植物生长有促进作用 C .清水组的禾谷类植物受自身合成的生长素的调节 D .0.1mg·L-1油菜素可增强生长素对该禾谷类植物生长的抑制作用
A.
B.
C.
D.
D
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