为什么塑件要设计成圆角的形式？

某煤矿8月份生产销售煤炭50万吨，另自用煤炭10万吨加工煤炭制品，生产天然气1000万立方米。已知该煤矿适用的税额为1.2元/吨，煤矿邻近的某石油管理局天然气适用的税额为4元/千立方米。该煤矿8月份应纳的资源税额为( )。

A．60万元

B．64万元

C．72万元

D．76万元

The following questions present a sentence, part of which or all of which is underlined. Beneath the sentence, you will find five ways of phrasing the underlined part. The first of these repeats the original; the other four are different. If you think the original is best, choose the first answer; otherwise choose one of the others.

These questions test correctness and effectiveness of expression. In choosing your answer, follow the requirements of standard written English; that is, pay attention to grammar, choice of words, and sentence construction. Choose the answer that produces the most effective sentence; this answer should be clear and exact, without awkwardness, ambiguity, redundancy, or grammatical error.

Under SEC guidelines, a company in this situation is required either to submit revised financial statements or that they withdraw their plans for a public stock offering.（）

A. that they withdraw their plans

B. to with draw its plans

C. that it withdraw planning

D. to have been withdrawn from their plans

E. it should withdraw its plans

低渗性脱水常见原因不包括（）

A.频繁呕吐

B.严重腹泻

C.高热

D.大面积烧伤

E.长期胃肠减压

船只在海上发生事故后，饮用水缺乏常常是幸存者面临的首要问题。海水不可以饮用的原因是______。

A．海水中含有大量电解质，与人体的电解质构成有很大差异，海水进入人体后会造成人体电解质紊乱，甚至造成死亡
B．海水中含有大量电解质，渗透压远远大于人体细胞内液，海水进入人体会造成人体细胞脱水，甚至造成死亡
C．海水中含有大量电解质，某些电解质对于人体而言是有毒的，海水进入人体后会造成中毒，甚至造成死亡
D．海水中含有大量电解质，味道又咸又涩，难以下咽

支气管扩张症患者咯血最常见的诱因为（）。