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
题目
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
相似考题
参考答案和解析
42．答案为A。根据第一段第二、三句，the earth at some time in its very early history became hot enough to melt the materials from which it was formed。While in this molten state作出该项选择。
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第1题：
According ______ the report，the ship hit the wharf when berthing．
A.of
B.to
C.for
D.on
正确答案：B
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第2题：
8、基于initial语句产生普通时钟信号， parameter clk_period = 10; reg clk; initial begin clk = 0; ________________; end
A．always #(clk_period/2) clk = ~clk
B．forever #(clk_period/2) clk = ~clk
C．always #(clk_period) clk = ~clk
D．forever #(clk_period) clk = ~clk
always #(clk_period/2) clk = ~clk;forever #(clk_period/2) clk = ~clk -
第3题：
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A．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}
create_clock “PHI1” –period 10 –waveform {5.0 9.5} -
第4题：
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编码序列 -
第5题：
基于initial语句产生普通时钟信号， parameter clk_period = 10; reg clk; initial begin clk = 0; ________________; end
A．always #(clk_period/2) clk = ~clk
B．forever #(clk_period/2) clk = ~clk
C．always #(clk_period) clk = ~clk
D．forever #(clk_period) clk = ~clk
always #(clk_period/2) clk = ~clk;forever #(clk_period/2) clk = ~clk -
第6题：
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）
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VDB（cost，salvage，life，start-period，end-period，factor，no-switch）