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问题 选择题

下图为反射弧模式图,请选择下列陈述中正确的选项

①若在a点上刺激,神经就发生兴奋,从这一点向肌肉方向传播,肌肉就收缩。 ②若在b点上刺激,神经就发生兴奋,从这一点向肌肉方向传播, 肌肉就收缩。 ③a处神经元的神经末梢所连接的是感受器 ④当兴奋时,神经细胞膜的离子通透性会急剧发生变化,钾离子 流入细胞内

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A．①②③

B．①②④

C．②③

D．①②

答案

答案：D

填空题

泵房管子道与井筒连接处应高出井底车场轨面7m以上，并应设置平台，该平台必须与井筒中（）相通，以便人员行走。
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单项选择题

In the simplest form of international trade, the open-account basis, banks actually have only a simple transactions role. In the open-account basis, the importer and exporter are well known to each other and probably have established a successful working relationship. The importer orders goods and promptly pays for them when the goods and title thereto are received. Almost as simple is the foreign collection basis, in which a bank is used to transmit collected funds. Before the goods it has bought can be shipped, the importer must place funds with its bank so that the exporter is assured that payment will be made with collected funds. In this instance, the bank is merely an agent and not a lender.

The exporter has gotten the funds before he ships the goods in foreign collection.

A. Right

B. Wrong

C. Doesn’t say
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