T4的定义是（）

[问答题]Practice 10　　The U. S. Dollar is the currency most often used in international trade. If the currency of export sales is different from the currency of the exporting country, for example a Japanese exporter sells in U.S.　　Dollars, the exporter may encounter exchange risks-risks from fluctuations in exchange rates, for example between the U. S. Dollar and the Japanese Yen.　　In case of the Yen appreciation at the time of converting the U.S. Dollar to the Yen, the exporter will get less Yen per U.S. Dollar. Conversely, in case of the Yen devaluation the exporter will get more Yen per U.S. Dollar. Hence, in time of currency appreciation in the exporting country, it is important that the exporter ships the goods earlier, unless an earliest date for shipment is stipulated in the L/C or has been agreed upon between exporter and importer, and present the negotiating documents to the bank immediately.　　The exporter may contract with the bank to sell the U.S. Dollar forward in a so-called forward exchange, at a predetermined rate on an agreed future date, thus he/she will not be affected by the currency appreciation and will receive a fixed amount in his/her own currency at a future date.

[单选题]油气管线发生爆炸事故后，各种有毒有害物质由管线喷出，可能会污染周围的大气、土地及（）

[判断题]旅行社可依法将旅游业务委托给其他旅行社，接受委托的旅行社由于重大过失造成旅游者合法权益损害的，应当承担连带责任。    (    )

[单选题]细菌鞭毛的作用主要是

[单选题]使用白盒测试方法时，设计测试用例应根据（　　）。

[单选题]设某生产函数为Q=4L+500，则（）

[单选题]下列关于移动式车身、车架矫正拉拔器的叙述错误的是（）。

[多选题]有关仲裁庭制度表述正确的是（）。

[单选题]闭合蓄电池开关XK，电压表无显示的原因（）

[单选题]当体内碳水化合物不足时，机体为了满足身体对葡萄糖的需要，可通过下列途径产生葡萄糖的是（）。