A、I<sub>p</sub>=0
B、I<sub>p</sub>=I<sub>z</sub>+I<sub>y</sub>
C、<img width="103" height="29" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/761467a9-94fd-4f6e-a2c6-8c1ff47fa0bc.png" />
D、<img width="83" height="28" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/2da9632f-a77f-4a56-9de1-4e2c1ab06e56.png" />
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