若壓力為F,橫截面積為S時,壓強(qiáng)為P,那么
A.當(dāng)壓力變?yōu)?F、橫截面積變?yōu)?S時,壓強(qiáng)變?yōu)?P
B.當(dāng)壓力變?yōu)?IMG style="WIDTH: 9px; HEIGHT: 34px; VERTICAL-ALIGN: middle" src="http://thumb.zyjl.cn/pic1/upload/papers/c04/20120806/20120806162808557659.png">、橫截面積變?yōu)?IMG style="WIDTH: 9px; HEIGHT: 34px; VERTICAL-ALIGN: middle" src="http://thumb.zyjl.cn/pic1/upload/papers/c04/20120806/20120806162808639614.png">時,壓強(qiáng)變?yōu)?IMG style="WIDTH: 9px; HEIGHT: 34px; VERTICAL-ALIGN: middle" src="http://thumb.zyjl.cn/pic1/upload/papers/c04/20120806/20120806162808717631.png">
C.當(dāng)壓力變?yōu)?F、橫截面積變?yōu)?IMG style="WIDTH: 9px; HEIGHT: 34px; VERTICAL-ALIGN: middle" src="http://thumb.zyjl.cn/pic1/upload/papers/c04/20120806/20120806162808795614.png">時,壓強(qiáng)變?yōu)?IMG style="WIDTH: 9px; HEIGHT: 34px; VERTICAL-ALIGN: middle" src="http://thumb.zyjl.cn/pic1/upload/papers/c04/20120806/20120806162808874642.png">
D.當(dāng)壓力變?yōu)?IMG style="WIDTH: 9px; HEIGHT: 34px; VERTICAL-ALIGN: middle" src="http://thumb.zyjl.cn/pic1/upload/papers/c04/20120806/20120806162808953666.png">、橫截面積變?yōu)?S時,壓強(qiáng)變?yōu)?IMG style="WIDTH: 9px; HEIGHT: 34px; VERTICAL-ALIGN: middle" src="http://thumb.zyjl.cn/pic1/upload/papers/c04/20120806/20120806162809030642.png">