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【单选题】
In order for a cell to carry out its biologic functions, the intracellular reactions need to be directed to follow a certain pathway. Which one statement best describes the direction a chemical reaction will follow?A.
A reaction with positive free energy will proceed in the forward direction if the substrate concentration is raised high enough.
B.
Under standard conditions, a reaction will proceed in the forward direction if the free energy Δ G0 ′ is positive.
C.
The direction of a reaction is independent of the initial substrate and product concentrations because the direction is determined by the change in free energy.
D.
The concentration of all of the substrates must be higher than that of all of the products for the reaction to proceed in the forward direction.
E.
The enzyme for the reaction must be working at >50% of its maximum efficiency for the reaction to proceed in the forward direction.
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【单选题】低压电器 是指用于交流额定电压( )V及以下、直流额定电压1500V及以下的电路中起通断、保护、控制或调节作用的电器产品。
A.
1500
B.
1000
C.
1200
D.
1100
【简答题】低压电器是指用于交流额定电压在( )V以下、直流额定电压在( )V以下的电路中的电气设备。在电路中起通断、控制、保护和调节作用的电气。
【简答题】低压电器通常是指用于交流额定电压为 、直流额定电压为 的电路内起通断、保护、控制或调节作用的电器 。