刷底油根据粘贴部位和使用环境选择，其中正确的是（）。A.湿度比较大宜选用清漆 B.湿

下列说法中正确的是（　　）

A．氨水能够导电，故氨水是电解质

B．硫酸钡难溶于水，但硫酸钡属于强电解质

C．二氧化碳溶于水能部分电离，故二氧化碳属于弱电解质

D．硫酸钠在水中的电离方程式可表示为Na₂SO₄═2Na⁺+S⁶⁺+4O^2-

抓斗挖泥船生产率计算公式中的主要参数有（）。

A.每小时抓取斗数

B.抓斗充泥系数

C.土的搅松系数

D.挖深

E.抓斗容积

已知函数y=（k+5）x2-4x+1，当x取一切实数时，函数值y恒为正，则常数k的取值范围是（　　） A．k＞-1 B．k＞-5 C．-5＜k＜-1 D．k＜-5

关于逮捕程序，下列哪一说法是错误的

A．公安机关对人民检察院不批准逮捕的决定，认为有错误的，可以向上一级人民检察院申请复议一次

B．逮捕后除有碍侦查或无法通知的情形以外，应由决定逮捕的机关把逮捕的原因和羁押的住所，在24小时以内通知被逮捕人的家属或他的所在单位

C．犯罪嫌疑人被逮捕后，公安司法机关须在24小时以内进行讯问

D．逮捕犯罪嫌疑人，必须经人民检察院的批准或决定

Passage Two

Five years ago, David Smith wore an expensive suit to work every day. "I was a clothes addict," he jokes. "I used to carry a fresh suit to work with me so I could change if my clothes got wrinkled. " Today David wears casual clothes—khaki pants and sports shirt—to the office. He hardly ever wears a necktie. "I’m working harder than ever," David says, "and I need to feel comfortable. "
More and more companies are allowing their office workers to wear casual clothes to work in the United States. The change from formal to casual office wear has been gradual. In the early 1990s, many companies allowed their employees to wear casual clothes on Friday (but only on Friday). This became known as "dress-down Friday" of "casual Friday". "What started out as an extra one-day-a-week benefit for employees has really become an everyday thing. " said business consultant Maisly Jones.
Why have so many companies started allowing their employees to wear casual clothes One reason is that it’s easier for a company to attract new employees if it has a casual dress code. "A lot of young people don’t want to dress up for work, "says the owner of a software company, "so it’s hard to hire people if you have a conservative dress code. "Another reason is that people seem happier more productive when they are wearing comfortable clothes. In a study conducted by Levi Strauss and & Co. , 85 percent of employers said that they believe that casual dress improves employee morale. Only 4 percent of employers said that casual dress has a negative impact on productivity. Supporters of casual office wear also argue that a casual dress code helps them save money. "Suits are expensive, if you have to wear one every day," one person said. "For the same amount of money, you can buy a lot more casual clothes. \

According to this passage, which of the following statements is false

A．Many employees don’t like a conservative dress code.

B．Comfortable clothes make employees more productive.

C．A casual clothes code is welcomed by young employees.

D．All the employers in the U. S. are for casual office wear.