下列哪种药物琥珀胆碱与合用水解速度减慢（） A.乙醚 B.氟哌利多 C.普鲁卡因 D 发布时间：2017-08-12 23:40 │ 来源：www.tikuol.com 题型：单项选择题 问题： 下列哪种药物琥珀胆碱与合用水解速度减慢（）A.乙醚B.氟哌利多C.普鲁卡因D.甲氧明E.上述均不是
题型：单项选择题 阅读下面短文，请从方框中选出适当的句子填入文中的适当位置，使短文内容完整正确。 If there is a test at school today, you may feel awful. Your stomach may hurt and you may have a headache. Maybe even your muscles feel tense. 1 You're womed about your test because you didn't do well on the last one, or maybe you're nervous because you did well on the last one. What should you do? Ask for help. Talk to your mom, dad or your teacher. 2 They can help you find some solutions. Be prepared. Do your homework. 3 On the test day, you're more likely to feel that you know the answers. Believe in yourself. 4 "I studied and I'm ready to do my best. " Don't tell yourself "I'm not goodat it. " or "I'm going to freak out(崩溃) if I get a bad grade. " 5 Take good care of yourself. You'll feel your best if you get enough playtime, sleep and nutritious(有营养的) food. This is important all the time.Talking to someone about it can make you feel better.Study for the test.That means you are too worried.These thoughts can make it harder for you to do well.Say to yourself. 查看答案
题型：单项选择题 在隔离式开关电源中，使用光耦作为输入输出隔离，但必须遵循的原则是（）；A.所选的光耦器件必须符合有关隔离击穿电压标准B.必须有足够的电流驱动能力C.若用放大电路驱动光耦，必须保证它能够补偿耦合器的温度不稳定和漂移D.所选的光耦器件必须有较高的耦合系数； 查看答案