为了检验二氧化碳是否充满集气瓶，正确的方法是 A．加入澄清石灰

为了检验二氧化碳是否充满集气瓶，正确的方法是

A．加入澄清石灰水 B．滴入紫色石蕊试液

C．用燃着的木条放在瓶口 D．用燃着的木条迅速伸入瓶底

答案

相关题目

相同温度下，体积均为0.25 L的两个恒容密闭容器中发生可逆

相同温度下，体积均为0.25 L的两个恒容密闭容器中发生可逆反应： N2(g)＋3H2(g)2NH3(g) ΔH＝－92.6 kJ·mol－1。实验测得起始、平衡时的有关数据如下表所示

阅读下列材料：材料一是以其(君主)未得之(天下)也，荼毒

阅读下列材料：材料一是以其(君主)未得之(天下)也，荼毒天下之肝脑，离散天下之子女，以博我一人之产业，曾不惨然，曰：我固为子孙创业也。其

1. Mrs. Green doesn’t want ___ (this) socks. 2. Helen ___ (want) to go to sch

1. Mrs. Green doesn’t want ___ (this) socks. 2. Helen ___ (want) to go to school on foot. 3. My sister ___ (not) know what it is. 4. ___ (that) books are in English. 1. these 2. wants 3. does

能证明苯酚具有弱酸性的实验是（） A.加入浓溴水生成

能证明苯酚具有弱酸性的实验是（） A.加入浓溴水生成白色沉淀 B.苯酚钠溶液中通入CO2后，溶液由澄清变浑浊 C.浑浊的苯酚加热后变澄清 D.苯酚的

With the worldwide oil crisis, the price of oil has been raised ______ 15%. �

With the worldwide oil crisis, the price of oil has been raised ______ 15%. A. about B. with C. of D. by

下列函数，既是奇函数，又在区间(0，＋∞)上是减函数的是(

下列函数，既是奇函数，又在区间(0，＋∞)上是减函数的是( ) A．f(x)＝－x2 B．f(x)＝ C．f(x)＝

Left ____ in the reading room alone quite by accident, the boy felt nervous.

Left ____ in the reading room alone quite by accident, the boy felt nervous. A. locking B. having locked C. to lock D. locked

Now that you have accepted the task, the only thing you can do now is ______ on

Now that you have accepted the task, the only thing you can do now is ______ on how to fulfill it. A. reflect B. try

为了检验二氧化碳是否充满集气瓶，正确的方法是 A．加入澄清石灰

答案

相关题目

最新题目