【简答题】将 Rp 大致调到中间位置,仅闭合 K2 ,用示波器观察 J1 点的波形是 , J2 点的波形是 , J7 点的波形是 , J8 点的波形是 。(以上填正弦波 / 三角波 / 矩形波 / 尖峰波)
【单选题】—What are you going to do? —I will buy a book________. [ ]
【单选题】What type of sentence is 'My sister likes apple, but I like orange.'?
B.
A coordinate sentence.
【判断题】墙面和展板上的展品陈列位置,一般是从距离地面80cm起 ,上320cm为止。
【单选题】在RLC串联正弦交流电路中,已知R=20Ω,XL=40Ω,Xc=80Ω,则该电路呈( )。
【判断题】在 RLC 串联 正弦 交流电路中, 已知R =20 Ω ,XL =80 Ω ,Xc =40 Ω ,则该电路呈电感性。( )
【简答题】Sunday________(1) the favorite day for our family. My parents________(2) not________(3) work. My sister and I ________(4) go to school. We________(5) at home and________(6) in the morning. In the afte...
【单选题】在RLC串联正弦交流电路中,已知R=20Ω,XL=80Ω,XC=40Ω,则该电路呈( )。
【单选题】My vessel is healthy and I request free pratique.What does the sentence My vessel is healthy mean?It means: ______.
A.
My ship has been maintained
B.
My ship has been painted
C.
All my crew members have been vaccinated
D.
All my crew members have no quarantinable diseases