【单选题】He sat there dong nothing else __.
【单选题】()是及时发现危险、有害因素、消除事故隐患的主要措施;是实现设备环境安全化的重要保证。
【单选题】Scarcely ______ down when ______ a knock at the door.
A.
had he sat; did he hear
B.
he had sat; did he hear
【单选题】Amy: When he sat down, he told us about a car accident he'd seen.
A.
First, he sat down. Then he told them about an accident.
B.
First, he told them about an accident. Then he sat down.
【简答题】阅读理解。 Wu Dong has a good friend.His name is Peter.He is from the U.S.A.Wu Dong and Peter are in the same class.They go to school five days a week.They stay at home on Saturday and Sunday.Peter likes C...
【单选题】电路中某点的电位,在参考点给定后,与选取的路径 。