解一元二次方程,用直接开平方法,配方法,公式解法,因式分解法来做!

平均每日可以摄入某营养素的最高量是

A.EAR

B.RNI

C.DRI

D.AI

E.UL

请帮忙给出正确答案和分析，谢谢！

一名男工长期从事汞作业，有神经衰弱症状和尿汞升高等症状，已诊断为轻度汞吸收，较早和较好的处理原则是

A、及时调离汞作业场所继续观察

B、驱汞治疗

C、从事轻度汞作业工作

D、休息

E、住院治疗

请帮忙给出正确答案和分析，谢谢！

What does "His parents are dead against the trip" mean？

A．His parents are dead because of me trip.

B．His parents are quite in opposition to me trip.

C．His parents are hardly against the trip.

D．His parents have a very hard time during me trip.

请帮忙给出正确答案和分析，谢谢！

The caller warned that the bomb would explode when the plane______.

A．took off from New York

B．arrived at Moscow

C．left for Iceland

D．reached Voronezh

请帮忙给出正确答案和分析，谢谢！

用叶中含梗测定仪和烟梗筛测定叶中含梗率，下列操作时间正确的有：()。

A.3分钟

B.4分钟

C.5分钟

D.6分钟

此题为多项选择题。请帮忙给出正确答案和分析，谢谢！

It can be inferred that______.

A．the Japanese government has contributed to the saving of the dying native tongue

B．the eight elderly people have to teach their native tongue to foreigners

C．Japanese people now are very interested in learning Ainu

D．the Japanese government has forced its young people to learn Ainu

请帮忙给出正确答案和分析，谢谢！