用游标卡尺法测量颗粒最大长度方向与最大厚度方向的尺寸之比,大于( )的颗粒为针片状颗粒。
A.2
B.3
C.4
D.5
参考答案:B
用所给词的适当形式填空。
1. My cousin often ________ a kite with me on Sunday afternoon. (fly)
2. Andy's father ________ any housework at home. (not do)
3. Thanks for_________ with me. (chat)
4. Miss Gao doesn't teach _________ (we) English this term
5. Kitty has no time_________ (practice) dancing
6. How many _________ (tooth) does the baby have ? Only one.
7. We all like Jim because he's polite and _________ (help).
8. How often does she go to the school library? _________ a week. (two)
9. June 1st is _________(child) Day.
10. Would you like __________ (learn) more about the world?
干燥种子的吸水过程属于()。
A.渗透吸水
B.吸胀吸水
C.降压吸水
D.升压吸水