胶头滴管在使用过程中不能平放或者倒置的原因是( ) A.防止试剂腐蚀囊 B.防止

题型:选择题

问题:

胶头滴管在使用过程中不能平放或者倒置的原因是(  )

A.防止试剂腐蚀囊

B.防止试剂腐蚀皮肤

C.防止试剂挥发

D.防止液体流出

考点:药品的取用
题型:选择题

田间试验观察与记载的内容有哪些?

题型:选择题

Beijing: The United States and North Korea had their first ______ in four months here this afternoon as part of the ______ negotiations on how to end North Korea’s nuclear program, but diplomats played down prospects for______. James A. Kelly, assistant ______, and Kim Yong Ⅱ, North Korea’s deputy foreign minister, met ______ of formal discussions, ______ on direct dialogue that began after a stormy meeting ______ in which North Korea warned that it was moving quickly to ______ nuclear arms. The Bush administration had insisted ______ that it would only hold talks with North Korea ______ because, it argued, only ______ pressure would persuade North Korea to______. It got its way when North Korea dropped its insistence on ______ and agreed, after extensive efforts by China, to hold unusual simultaneous negotiations with ______,______,______ and ______ as well as the United States. Though Bush administration officials had not ______ talking privately with the North Koreans during______, the fact that Mr. Kelly and Mr. Kim met on the first day was seen as a sign of ______ by the American side.

题型:选择题

某女,18岁,双眼视物不清伴眼球转动时疼痛1周。眼部检查:视力:右眼0.06,左眼0.08,不能矫正;双眼角膜透明,前房深浅正常,瞳孔大小正常,对光反应稍迟钝,晶状体无明显混浊,眼底可见视盘边界清,颜色大致正常,C/D≈0.3,A/V=2:3,黄斑中心凹未见明显水肿,中心凹反光点可见。

首选的治疗方法为()

A.抗生素

B.糖皮质激素

C.扩张血管,改善供血

D.神经营养药

E.以上都不是

题型:选择题

按光波在时间、空间上的相位特征,将光源分为()。

题型:选择题

市场学

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