题型:问答题 简答题 某横波在介质中沿x轴正方向传播,t=0时刻,O点开始向正方向运动,经t=0.2 s,O点第一次到达正方向最大位移处,某时刻形成的波形如图所示,下列说法正确的是________.A.该横波的波速为5 m/sB.质点L与质点N都运动起来后,它们的运动方向总相反C.在0.2 s的时间内质点M通过的路程为1 mD.在t=2.6 s时刻,质点M处于平衡位置,正沿y轴负方向运动E.图示波形图可能是t=1.2 s时刻的 查看答案
题型:问答题 简答题 完形填空。 Mrs Wang lives in Nanjing now. She is 102 years old. People often ask her 1 she can keep healthy inher life. Mrs Wang says everyone 2 live to 102 if he eats healthy food and does some exercise every day. Mrs wang thinks, first of all, 3 is very important. She often 4 a glass of milk and two eggs for it atabout 8:00 a.m. Milk and eggs give her energy. So she doesn't often feel 5 in the morning. She 6 eats snacks because she doesn't think they are healthy food. She seldom eats meat too. She usually has some 7 and vegetables for lunch and supper. And 8 meals, she usually has an apple or a banana. Mrs wang does some exercise too. She thinks she is still young. She plays Taiji for 9 every day. Sometimes she also dances with her friends. "Do you want to be 10 forever (永远)? I'm sure you can if you have a good lifestyle!" Mrs Wang says to us. ( )1. A. what ( )2. A. can ( )3. A. lunch ( )4. A. is having ( )5. A. tired ( )6. A. often ( )7. A. pork ( )8. A. beside ( )9. A. a year ( )10. A. young B. when B. should B. breakfast B. are having B. happy B. usually B. rice B. in front of B. a week B. old C. where C. need C. supper C. has C. well C. always C. beef C. behind C. 2 o'clock C. luck D. how D. must D. dinner D. have D. excited D. never D. meat D. between D. half an hour D. hungry 查看答案
题型:问答题 简答题 22岁,未婚,有性生活史。因停经35天,下腹痛伴少量 * * 流血2小时急诊入院。查体:面色苍白,血压60/40mmHg,心率120次/分,腹肌紧张,有下腹压痛,反跳痛。妇科检查:子宫正常大小,质软,右附件区增厚,压痛明显,尿HCG(+)。B超提示:右附件见混合性包块,盆腔中量积液。为明确诊断首选()A.腹部X线拍片B.诊刮术C.全腹造影D.宫腔镜检查E.后穹隆穿刺术 查看答案