如图所示,已知电流表A1的读数为0.2A,电流表A的读数为0.3A.则通过灯泡L2的电流为_________。
0.1A
It is possible,and sometimes necessary, to strengthen the deck of a vessel for carriage of deck cargo by().
A.placing bunker on the deck
B.building a stage on which to place the cargo
C.welding steel feet to the deck, on which the cargo is placed
D.erecting vertical pillars under the deck to support the cargo
下图为某大陆多年平均1月、7月海平面气压(单位:百帕)分布图。读图,导致该大陆a月、b月气压状况不同的主要原因是()
①海陆热力性质差异
②太阳直射点的回归运动
③地形起伏
④洋流分布
A、①②
B、②③
C、①④
D、③④