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【简答题】
Piston rings function as the seal between the piston and the cylinder wall and also act to reduce friction by minimizing the contact area between the piston and the cylinder wall.
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【单选题】主观验光结果为-2.00/-2.00*180，角膜曲率仪检查结果为44.00/45.00@90,则晶体散光为
A.
-1.00DC*90
B.
-1.00DC*180
C.
-2.00DC*90
D.
-3.00DC*180
【单选题】主观验光结果为-5.00/-2.00*180,角膜曲率计检查结果为43.00@180,44.00@90,则眼内散光为
A.
-1.00*180
B.
-1.25*180
C.
-0.75*180
D.
-0.50*180
【单选题】Questions 5 to 7 are bassed on the news report you have just heard 阶段性测试一新闻3.mp3:
A.
Report the nicotine content of their cigarettes
B.
Set a limit to the production of their cigarettes
C.
Take steps to reduce nicotine in their products
D.
Study the effects of nicotine on young smokers
【单选题】主观验光结果为-1.00/-2.00*180,角膜曲率计检查结果为44.00@180,46.00@90,则残余散光为
A.
-2.00*180
B.
-2.00*90
C.
0
D.
-1.00*180
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