【单选题】如图,在保险丝处接入一个“220V 40W”的灯L0,当只闭合S、S1时L0和L1都呈暗红色,由此可以确定( )。
【多选题】如图,【图片】在保险丝处接入一个“220V 40W”的灯泡LO,当只闭合S、S1时LO和L1都呈暗红色;当只闭合S、S2时,L0正常发光,L2不发光。由此可以确定( )。
【单选题】如图, “ ”在保险丝处接入一个“220V 40W”的灯泡LO,当只闭合S、Sl时LO和L1都呈暗红色;由此可以确定( )。
【单选题】A bank issues a bill of exchange payable by another bank. The bill is:
【单选题】听力原文:A bank or insurance company issues a document to guarantee that exporter will supply the goods or services as the required standard. (4)
A.
A bank or insurance company issues an advance payment bond.
B.
A bank or insurance company issues a tender bond.
C.
A bank or insurance company issues a maintenance bond.
D.
A bank or insurance company issues a performance bond.