棱长是1分米的正方体纸盒放在桌子上,纸盒所占桌面的面积是1平方分米.______.(判断对错)
根据以上分析知,这个纸盒占桌面的面积是:
1×1=1(平方分米).
故答案为:√.
在下列模拟路灯照明电路的光控开关电路中(RG为半导体光敏电阻,光照增强电阻变小、LED为发光二极管),能实现天暗时LED发光、天亮时LED熄灭的电路是:
The girl was drowned unfortunately. She ____, though, because there were so many people standing on the banks at that moment.
A.should have saved
B.could have been saved
C.should be saved
D.couldn’t have been saved