判断题 用解析法求平面汇交力系平衡问题时，所选取的两个轴必须相互垂直。

未知题型 Michael: The Johnsons are moving next week. We are going to have a going-away party for them Saturday. Tracy: I didn't realize they were moving so soon. ______. Michael: Yes, but we'll have one last chance to get together. We're planning a barbecuE.A.Wish them a happy journeyB.May they have a more comfortable homE.C.They are really going to be misseD.D.We can't stay together forever, can we?

未知题型 下列语句序列执行后，k的值是______。 public class Testll { public static void main(String[] args) { int a=10, b=18, c=30; switch(b%a){ case 7: c--;break; case 8: c-=2;break; case 9: c-=3;break; default: c * =b;break; } System.out.println(c); } }A.28B.27C.29D.540