【单选题】Are you from New York?
【单选题】What made the students in Auckland more excited in the new term?
【单选题】关于主键约束和唯一约束说法错误的是_______。
C.
允许空值的字段不能定义主键约束但可以定义唯一约束
【单选题】UN、IN、ηN、cosφN分别是三相异步电动机额定线电压,线电流、效率和功率因数,则三相异步电动机额定功率PN为( )。
A.
√3 U N I N η N cos φ N
【单选题】Which of the following statements is NOT a way of presenting new vocabulary?
C.
Writing a passage by using new words.
【简答题】(airframes )______________ for 20 new planes ______________.
【单选题】When will the new airport __________?
【单选题】—Is the mobile phone new or old? —________. I bought it only two days ago.
【单选题】A new library __________.
【判断题】变频器的输出频率是可变的,但输出电压是不变的