【判断题】泵的流量Q、扬程He、功率N、效率η,统称为离心泵的性能参数。
【单选题】某一商标由甲、乙两个企业共同使用,其中甲企业于1988年开始使用,而乙企业于1990年开始使用,后因某种原因乙企业分立为丙、丁两家企业,乙企业不复存在。1994年3月28日和4月2日,丙、丁两家分别向商标管理机关申请注册,则商标管理机关应核准( )提出的商标注册申请。
【简答题】Read the paragraphs and answer the questions. Write NO MORE THAN THREE WORDS for each answer. (Total Time: no more than 2 minutes for each paragraph) Paragraph 2 The answer to the question, “Which was...
【单选题】听力原文:M: British English and American English are really about the same, aren't they? W: I don't think so. It seems to the that some of the spellings are different. Words like theater and center end in...
A.
The differences between British English and American English.
B.
The similarities between British English and American English.
C.
The spelling differences between British English and American English.
D.
The pronunciation differences between British English and American English.
【单选题】把一个带 电量的点电荷放在 轴上原点处,形成一个电场.已知在该电场中,距离原点为 处的单位电荷受到的电场力由公式 ( 为常数)确定.在该电场中,一个单位正电荷在电场力的作用下,沿着 轴的方向从 处移动到 处,电场力对它所做的功为
【单选题】已知数据: 1 18,32 ,- 6,14,8,12 ; 2 21,4,7,14 ,- 3,11 ; 3 5,4,6,5,7,3 ; 4 - 1,3,1,0,0 ,- 3. 各组数据中平均数和中位数相等的是 ( )
【多选题】(不定项选择)在开始动平衡前,试车的目的是
【单选题】有甲、乙连续两项工作,甲工作最早开始时间是第4天,乙工作的最早开始时间是第10天,甲工作和乙工作的持续时间分别为4天和5天,则甲工作的自由时差是( )。
【简答题】阅读理解。 Students who say they never or hardly ever used dictionaries often speak English well but usually write poorly, because they make many mistakes. The students who use dictionaries most do not lea...
【单选题】下列各组数据中,平均数和中位数相等的是( )