正确答案: D

冶铁

题目：东汉南阳太守杜诗“造作水排，铸为农器，用力少，见功多，百姓便之"。“水排"主要应用于

解析：D

查看原题

举一反三的答案和解析：

[单选题]苔藓植物的孢子萌发形成原叶体。( )

错误

[单选题]--- Hi, Terry, can I use your computer for a while this afternoon?--- Sorry. __ .

It's being repaired

[单选题]His efforts to raise money for his program were because no one showed any intention to take a cent out of their pockets.

in vain

[单选题]The art show was _______ being a failure; it was a great success.

far from

[单选题]People tend to make mistake when ____.

they perform. several challenging tasks at a time.

[单选题]What effect does reading have on the author?

It opens up a wider world for him.

[单选题]中国古代，朝廷有时将不在户口册内且因此不纳税的人称为“盗贼”。这反映当时朝廷

要求民众纳税 只要求部分民众纳税我 不要求民众纳税 只要求部分“盗贼”纳税

[单选题]黄曲霉毒素是主要由黄曲霉菌产生的可致癌毒素，其生物合成受多个基因控制，也受温度、pH等因素影响。下列选项正确的是

黄曲霉菌产生黄曲霉毒素是表现型

[单选题]人参为著名的补气强壮药，其最主要的药用成分是多种( )。

人参皂苷