The first electric lamp had two carbon rods from which vapor served to conduct t

游客2025-05-04 24

问题 The first electric lamp had two carbon rods from which vapor served to conduct the current across the gap.

选项 A、The first
B、from which
C、served
D、across

答案 B应改为by which。

解析这里需要介词+关系词，按照语意，“在……周围，依赖……手段”用by。

转载请注明原文地址:https://www.tihaiku.com/zcyy/4061492.html

相关试题推荐

随机试题

最新回复(0)

Theflashingredlightservedasa______ofdangerahead.A、predictorB、caution