滚齿机滚刀主轴与前轴承的配合间隙为0.02～0.03mm。
参考答案：错
Lemonade is a favorite summer drink. It is enjoyed at family meals, picnic, ball games, and many special parties. People like its light, lemony taste. They also like it because it keeps them from getting too thirsty. Do you drink it Fresh lemonade can be made by cutting a lemon in half and squeezing the juice into a cup. After the seeds are taken out, sugar and water are mixed in. One cup of lemon juice, One cup of sugar, and two quarts of water stirred together make good lemonade. There are even easier ways to get lemonade. One way is to buy lemonade powder. Then add the right amount of water. Another way is to buy cans of frozen lemonade and mix it with water. The easiest way of all is to buy and open a can of lemonade that is ready to drink, just like a can of juice. Lemonade is good for people. It has vitamin C. It keeps the body cool in summer. When served hot it can help a bad cold or a sore throat. Lemonade is not a new drink. It has been around for a long time. Some say it came from China. Others think it probably came from England or France. More than four hundred years ago an English doctor wrote about the good that lemonade can do for people.
In order to make good lemonade with one cup of lemon juice, we should add to it ______.
A．two spoons of sugar and two quarts of water
B．one cup of sugar and two quarts of water
C．one cup of sugar and one quart of water
D．one spoon of sugar and one quart of water
（9分）Q、R、X、Y、Z五种元素的原子序数依次递增。已知：①Z元素基态原子的M层全充满，N层没有成对电子，只有一个未成对电子，其余的均为短周期主族元素； ②Y原子价电子排布msnmpn ③R原子核外L层电子数为奇数； ④Q、X原子p轨道的电子数分别为2和4。请回答下列问题：
（1）Z的元素符号为_______，在周期表中的____ 分区。
（2）向Z的硫酸盐的溶液中逐滴加入R的氢化物的水溶液至过量，可观察到的现象为___________．此时Z2+与R的氢化物形成了配位数为4的配合物离子，该离子中化学键的类型有 （填序号）。
A 配位键 B 极性共价键 C 非极性共价键 D 离子键
（3）氢化物的沸点：X的比同族其它元素高的原因是 。Q和Y形成的最简单气态氢化物分别为甲、乙，下列判断正确的是___ __（填序号）。
a．稳定性：甲＞乙，沸点：甲＞乙 b．稳定性：甲＞乙，沸点：甲＜乙
c．稳定性：甲＜乙，沸点：甲＜乙 d．稳定性：甲＜乙，沸点：甲＞乙
（4）Q、R、X的第一电离能由小到大的顺序为_______________。R、X、Y四种元素的原子半径由小到大的顺序为_______ _（均用元素符号表示）。
（5）Q的一种氢化物相对分子质量为26，其中分子中的σ键与π键的键数之比为____ _。
