生精细胞中哪种细胞体积最大A．精原细胞B．初级精母细胞C．次级精母细胞D．精子细胞E

根据短文内容，判断下列句子正(T)误(F)。

     Jack is an English boy in our class. He is tall and handsome (英俊的). He has a big nose and two

big blue eyes. His hair is light brown. He likes music (音乐). He likes to play basketball. He is on our

school basketball team (队). He can speak some Chinese, but he can’t write (写)it. We help him with

his Chinese. He helps us with our English. We are good friends.

( ) 1. Jack has a big nose and big blue eyes.

( ) 2. Jack’s hair is light yellow.

( ) 3. Jack likes to play football.

( ) 4. Jack can speak some Chinese.

( ) 5. Jack help us with our Japanese.

—What _____ honest boy Jack is!      

—Yes. We all like him.       [ ]

A. a          

B. /            

C. an        

D. the

关于产后泌尿系统感染，描述错误的是 （）

A.以大肠埃希菌感染多见

B.膀胱炎患者通常有发热、寒战等全身症状

C.给予敏感有效抗生素治疗

D.症状减轻后仍需坚持用药

E.保证每日尿量2000ml以上

路线价法估价时需要用路线价再配合( )计算出待估宗地的价格。

A．深度百分率

B．资本化率

C．收益率

D．其他价格修正率

E．物价指数

预热的作用是能够（）焊后冷却速度。

A.加快

B.提前

C.降低