肝素的抗凝作用需依赖肝素酶。()

There are four seasons in a year in China. February, March, and April make the spring season. .May, June and July make the summer season. August, September and October make the autumn season.. November, December and January make the winter season..

Near the North Pole(南极)there are only two seasons. They are winter and summer. The nights in winter are very long. For more than two months you can’t see the sun, even at noon. In summer the days are long. For more than two months the sun never sets, and there is no night.

In the tropics（热带） there are also two seasons: a rainy season and a dry season.

小题1:There are _________seasons in years in China.

A． two

B． four

C． three

D． one小题2:In the tropics there are ________seasons.

A． two

B． four

C． three

D． one小题3:The two seasons near the North Pole are _______.

A． spring and autumn

B． winter and summer

C． rainy season and dry season

D． spring and winter小题4:Autumn in China______.

A． cool

B． lasts from September to November

C． is hot

D． the days are less than two months小题5:Near the North Pole _______in summer.

A． the days aren’t long

B． the days are long

C． there is no night

D． the days are less than two months

（1）在甲图中，作出物体AB在平面镜MN中所成的像．

（2）用一平面镜将与水平面成30°角的太阳光竖直照射到深井内，请你在乙图中画出平面镜的位置，并标出反射角的大小．

（3）如图A是平面镜，B是眼睛，C是眼睛看到蜡烛D在平面镜中所成的像．

①根据平面镜成像的特点作出像点C对应的物点D．

②完成眼睛看到C的光路图（画一条入射光线和反射光线即可）．

什么是猪弓形虫病？如何防治？

以下哪些为管理信息系统的任务　　Ⅰ．对内部数据和外部数据的收集和传输　　Ⅱ．对数据进行分散的或集中的存储和管理　　Ⅲ，按业务需求对数据进行加工和整理

A．Ⅰ和Ⅲ

B．Ⅰ和Ⅱ

C．Ⅱ和Ⅲ

D．全部

盐酸普鲁卡因注射液中对氨基苯甲酸的限量为（）

A．1．2％

B．0．005％

C．0．06％

D．0．02％

E．0．1％