义务兵服现役的期限为()

阅读理解。根据短文内容，判断正(T )误(F ).。

     Hai Di lived in a city in the north. He wanted to visit some places in the south, but he didn't want to

 spend too much money.

     Last summer he had a short vacation. He decided to take a trip to Hainan. He talked to a friend about

  his plan, "If you go by plane, you'll get there in a few hours.  then you have more time for sighteeing. If

 you go by train, it'll take you four or five days to get there".

     He left in the middle of June and got back to work at the end of the month. It took him more than two

  weeks at the end of the month. It took him more than two weeks to make the trip. What's the matter?He

  went by ship for most of the journey.

( ) 1. Hai Di lives in a city in the south.

( ) 2. Hai Di had a short holiday last year.

(     ) 3. The trip to the south took him over two weeks.

(     ) 4. Hai Di came back in June.

( ) 5. It takes a few days to travel from the north to the south by plane.

“黄铜”是铜、锌合金，为了测定某黄铜样品中锌的质量分数，甲、乙、丙三位同学分别进行实验，实验数据如下：（烧杯质量均为56g）

请回答下列问题：

（1）      同学取用的稀盐酸和样品恰好完全反应，他制取的氢气的质量是            。

（2）计算黄铜样品中锌的质量分数。

以下哪个是反映小儿生长发育尤其是营养状况的指标（）。

A.身长

B.头围

C.体重

D.胸围

E.皮下脂肪

晶形粟粒疹指的是（）

A.白痱

B.红痱

C.深痱

D.脓痱