According to the passage, the earth in its very early period was ______.A. in molten stateB. in water stateC. in rock stateD. a vast ocean
According to the passage, the earth in its very early period was ______.
A. in molten state
B. in water state
C. in rock state
D. a vast ocean
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—What do you think of the _______car?—I think it is much better than his one.A. latest, lastB. lately, lastlyC. early, latelyD. early, lastly
8、基于initial语句产生普通时钟信号， parameter clk_period = 10; reg clk; initial begin clk = 0; ________________; endA．always #(clk_period/2) clk = ~clkB．forever #(clk_period/2) clk = ~clkC．always #(clk_period) clk = ~clkD．forever #(clk_period) clk = ~clk
基于initial语句产生普通时钟信号， parameter clk_period = 10; reg clk; initial begin clk = 0; ________________; endA．always #(clk_period/2) clk = ~clkB．forever #(clk_period/2) clk = ~clkC．always #(clk_period) clk = ~clkD．forever #(clk_period) clk = ~clk
在端口PHI1创建时钟周期为10，上升在5.0，下降在9.5A．create_clock “PHI1” –period 10 –waveform {5.0 9.5}B．create_clock “PHI1” period 10 –waveform {5.0 9.5}C．create_clock “PHI1” period 10 waveform {5.0 9.5}D．create_clock “PHI1” –period 10 –waveform {1 2}
以下关于VDB函数的语法正确的是（）。A．VDB（cost，salvage，life，period，factor）B．VDB（cost，salvage，life，period，month）C．VDB（cost，salvage，life，per）D．VDB（cost，salvage，life，start-period，end-period，factor，no-switch）