粗面内质网和滑面内质网在电镜下的主要区别是根据其表面是否附有核糖体。
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I'm hungry. Get me something __________.
A. eat
B. to eat
C. to be eat
D. for eating
It is difficult for a foreigner __________ Chinese.
A. write
B. to write
C. be written
D. written
The car is rather difficult __________.
A. to repair
B. to be repaired
C. repairing
D. being repaired
6. He was nowhere __________.a. to see b. to be seen c. seeing d. seen
A. to see
B. to be seen
C. seeing
D. seen