作简谐运动的物体,相位确定了,那么振动状态也就确定了。
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1.
A. He'sgotaheadache.
B. Hecan'tsleepatnight.
C. Hecoughsalot.
D. Hedoesn'tfeellikeeating.
2.
A. Havesomefood.
B. Cleanthetable.
C. Makeaphonecall.
D. Buyadictionary.
3.
A. Thesalesmanager.
B. Theinformationofficer.
C. Theofficesecretary.
D. Thechiefengineer.
4.
A. Teacherandstudent.
B. Managerandsecretary.
C. Policeofficeranddriver.
D. Husbandandwife.