代数式√9-x有意义时,实数x的取值范围是 __________.
结合全文,说明文中“窗子”的含意
潭中鱼可百许头,__________。(柳宗元《小石潭记》 )
She is ______ (good) than Alice at swimming.
2 3/5的分数单位是 ________,它有 ________个这样的分数单位.
电热膜是一种新型的电热器件,电热膜是在绝缘的聚酯薄膜表面,经过特殊工艺加工形成的一条条薄的导电墨线,导电墨线两端与金属导线相连,形成网状结构,其内部结构如图甲所示.电热膜取暖器工作时,室内空气温度升高是通过____方式增加空气内能的.将此电热膜接入电路,正常工作时金属导线中A、B处电流分别为IA和IB,则IA____IB(选填“>”、“<”或“=”);导电墨线电阻随温度变化的关系如图乙所示,电热膜不会因厚度不均而出现局部过热的现象,原因是____.
()1. Could you help me, please?A. OK.
()2. Thanks a lot.B. You're welcome.
()3. Let's put the books in the box.C. It's Monday.
()4. Can you carry it?D. No ,it's full.
()5. Who's on duty today?E. lam.
()6. Is it empty?F. No ,it's light.
()7. What day is it today?G. Certainly.
()8. Is that bag heavy?H. No. Li Lei isn't here. .
()9. Are we all here today?I. No ,thanks.
()10. Let me help you.J. Yes,I can.
Jason is used to ______ (watch) TV the whole night.
The director recommended that she ________ (study) more English before going abroad.