【判断题】夏天停车时,应尽量避免阳光直晒,以免加重空调的负担。
【单选题】— What are your students doing now? — They football. Let's go and have a look.
【单选题】电力系统潮流计算机计算时,以下关于节点类型正确的是( )。
A.
发电机节点一定是PV节点或平衡节点,负荷节点一定是PQ节点;
B.
PV 节点即已知节点无功功率和电压相角,求有功功率和电压幅值;
C.
发电机节点一般是PV节点或平衡节点;但特定的情况下也可转换为PQ节点,不管是否有无功电源,负荷节点在任何情况下不能选为PV节点;
D.
发电机达到无功出力极限的发电机节点可以选为PQ节点,有一定无功电源的负荷节点也可以选为PV节点。
【简答题】A.To show the key role played by air traffic controllers. B.To show the great responsibility shouldered by the pilots. C.To give an example of air disasters. D.To show that air travel is far safer tha...
【单选题】What will the club members do with the litter?
A.
They will place it in boxes.
B.
They will place it in aluminium cans.
C.
They will place it into trash bags.
D.
They will place it into garbage cans.
【简答题】succeed advanced common reflect reason smart deadline besides nearly intelt 1. George is a very boy; he is one of the best students in his class. 2. You have to work hard if you want to ...