计算:18-(π-2012)0-|2-3|-(13)-1.

题型:解答题

问题:

计算:
18
-(π-2012)0-|
2
-3|-(
1
3
-1
考点:零指数幂(负指数幂和指数为1)实数的运算
题型:解答题

属于真核细胞型微生物的是()

A.流感杆菌

B.衣氏放线菌

C.沙眼衣原体

D.白色念珠菌

E.肺炎支原体

题型:解答题

A. turn  B. eagerly  C. concerned  D. anxiously  E. growing   F. changed G. produced H. international   I. popular   J. called
 
There have been a lot of changes in American eating habits in the last ten years. One is the __小题1:__ awareness of the nutritional value of food. Another is an increasing interest in a variety of __小题2:__ foods. Since about 1970, Americans have been more and more __小题3:__ about health. They have begun to notice the ingredients(配料) in what they eat.
When they select food in the supermarket, they __小题4:__ the package over to read the labels carefully. They prefer to eat food that is __小题5:__ without unnecessary chemicals and often choose fruits and vegetables grown without poisons used to kill insects. A small group of Americans, __小题6:__ vegetarians, has decided not to eat meat. They choose a complete diet from other kinds of food because they think that meat products are not good for health.
Also more and more Americans have become interested in food from other countries. They have been going out to international restaurants and __小题7:__ trying unfamiliar dishes. Chinese, Japanese, French, Italian, and Greek cooking as well as many other recipes(食谱) are all __小题8:__ these days in the United States. People used to say that Americans ate uninteresting, unhealthy food, but this has __小题9:__ in the last ten years.
题型:解答题

根据以往的口腔流行病学调查结果,下面说法正确的是

A.根面龋最多

B.咬合面龋最多

C.颊舌面龋最多

D.近中面龋最多

E.远中面龋最多

题型:解答题

(4分)水通直流电,可以观察到正负电极上都出现      ,正负两极所产生的气体体积比为      ;用燃着的木条检验负极所产生的气体,可观察到的现象是      

      ,说明该气体具有        性。

题型:解答题

事故隐患是指现存系统中可导致事故发生的物的危险状态、人的不安全行为及管理上的缺陷。

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