皮皮学，免费搜题
登录
搜题
【单选题】
( ) 过度时,电弧稳定,飞溅小,良好,广泛用于薄板焊件的焊接和全位置焊接。A.
4
B.
粗滴
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】在CO 2 饱和水溶液中，CO 2 的浓度为0.034mol·L -1 ，设所有溶解的CO 2 与水结合成H 2 CO 3 ，计算溶液的pH值和CO 2- 3 的浓度。
【单选题】汽水是CO 2 的饱和溶液，其中存在如下平衡： H 2 CO 3 H ＋ ＋HCO 3 － ……① HCO 3 － H ＋ ＋CO 3 2 － ……② 将汽水倒入试管中分别进行下列实验，相应分析结论错误的是
A.
加热、平衡①、②可能都向左移动
B.
加入澄清石灰水，平衡①、②均向右移动
C.
加入CaCO 3 悬浊液，CaCO 3 的溶解平衡向正方向移动
D.
通入过量CO 2 或滴加氯水，溶液pH均减小
【单选题】—Would you like to go shopping with me? —I'd like to,______ I'm too busy.
A.
and
B.
so
C.
as
D.
but
【简答题】英译汉：lubrication
【单选题】---I haven’t seen Jack for three days, is he ill? ---_______. His mother told me that he was in hospital.
A.
I am afraid so
B.
I hope not
C.
I don’t expect
D.
I am afraid not
【单选题】. --- What can I do for? --- I’d like to buy a gift for my sister’s birthday, one at a proper price but of _____ great use and it’d better be ______ surprise.
A.
/; a
B.
the; a
C.
a; /
D.
/; the
【单选题】I shouldn’t have left him alone at home last night. He is only three years old. ( for )
A.
I shouldn’t have left him alone at home last night for he is only three years old.
B.
For I shouldn’t have left him alone at home last night, he is only three years old.
【单选题】在H 2 CO 3 饱和溶液中,CO 3 2- 的浓度为
A.
( cK Ө a1 (H 2 CO 3 )) 1/2
B.
( cK Ө a2 (H 2 CO 3 )) 1/2
C.
K Ө a1 (H 2 CO 3 )
D.
K Ө a2 (H 2 CO 3 )
相关题目：