【单选题】What is the main purpose of this passage?
A.
To look back to the early days of computers.
B.
To explain what technical problems may occur with computers.
C.
To discourage unnecessary investment in computers.
D.
To warn against a mentally lazy attitude towards computers.
【单选题】受体阻断剂(拮抗剂)的特点是:
D.
对受体无亲合力和效应力 E对受体单有亲合力
【单选题】Which of the following terms is defined as a back-up power source that provides power to radio installations for the purpose of conducting distress and safety communications when the vessel'main and e...
A.
Emergency back-up generator
B.
Reserve source of energy.
C.
Reserve source of diesel power
D.
Emergency diesel generator
【判断题】冯·诺依曼机由运算器、控制器、存储器和输入/输出设备组成。()
【单选题】24岁女,初次妊娠,胎盘最早合成的激素是:
【判断题】丙醇与乙二醇的相对分子质量相近,但是沸点比乙二醇低。