【单选题】某患者明晨将行冠状动脉搭桥手术,今晚影响其睡眠的首要因素最可能是
【单选题】They are types of exquisite fragility .
A.
types of delicate beauty
B.
kinds of poor health and weak
C.
types of being easy to become sick
D.
kinds of pale complexion
【单选题】电功率的计算公式P=UI,式中的U表示用电器两端的电压,I为通过用电器的电流,此公式适用于()。
【简答题】在电路中,已知一个电阻的阻值R和它消耗的电功率P,由电功率计算公式P= U 2 R 可得它两端的电压U为______.
【单选题】The best title for this passage could be ______.
A.
Types of Research Reports
B.
Types of Journal Articles
C.
Writing of research Reports
D.
Writing of Different Articles
【单选题】Business people exercise their leadership in the community service area()the commercial world.
【简答题】Which of the following statements does the writer support? A) The demand for commercial products will not necessarily keep increasing. B) Nuclear energy is something we cannot do without. C) Uranium i...
【单选题】在电路中,已知一个电阻的阻值R和它消耗的电功率P.由电功率计算公式 P= U 2 R 可得它两端的电压U 为( )
【判断题】由于计算电功率的公式有 P=U 2 /R ,所以阻值小的负载从电路中取用的电功率也就一定大。
【单选题】如果电功率记为P,电压记为U,电流记为I,时间记为t 。 电功率的公式应为()