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【单选题】
________5________ Ah, this is the classic case of self-sabotage (自我破坏) . If you always do that, pretty soon you'll believe it one hundred percent though it is not the truth. Never doubt that you can find time to relax and have fun: improve your work efficiency and rework you r schedule.A.
Better yet, shut it off completely to prevent yourself from using it too often .
B.
The following are some suggestions to help you find time for relaxation.
C.
Shut down your computer to avoid being distracted.
D.
You tell yourself you have no time to relax and have fun.
E.
Ge t started by writing down at least three tasks that must get done for tomorrow.
F.
Here are several reasons why you feel you always have no time for relaxation.
G.
You can avoid being affected by using noise-reducing earphones .
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【单选题】在蜗杆传动中，若模数和蜗杆分度圆直径一定，增加蜗杆头数，将使______。
A.
传动效率提高，滑动速度降低
B.
传动效率降低，滑动速度提高
C.
传动效率和滑动速度都提高
D.
传动效率和滑动速度都降低
【单选题】在蜗杆传动中, 若模数和蜗杆分度圆直径一定, 增加蜗杆头数,将使______。
A.
传动效率和滑动速度都提高
B.
传动效率提高，滑动速度降低
C.
传动效率降低，滑动速度提高
D.
传动效率和滑动速度都降低
【单选题】下列检测结果中，哪项对诊断传染性'单个核细胞'增多症最有意义
A.
EB病毒膜壳抗原(VCA)的IgG抗体阳性
B.
EB病毒膜壳抗原(VCA)的IgM抗体阳性
C.
嗜异性凝集试验阳性
D.
嗜异性抗体检测的单点试验阳性
E.
肝功能异常
【单选题】刘女士,49岁,已婚,农民,初中文化。主诉3天前白带增多、泡沫状,外阴瘙痒,伴有烧灼感对该病人应采取的妇科检查方法是()
A.
阴道窥器检查
B.
双合诊
C.
肛腹诊
D.
三合诊
E.
阴道镜检查
【单选题】在蜗杆传动中，若模数和蜗杆分度圆直径一定，增加蜗杆头数，将使（）
A.
传动效率提高、滑动速度降低
B.
传动效率降低、滑动速度提高
C.
传动效率提高、滑动速度提高
D.
传动效率降低、滑动速度降低
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