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【单选题】
氟离子选择电极在使用前需用低浓度的氟溶液浸泡数小时,其目的()。A.
活化电极
B.
检查电极的好坏
C.
清洗电极
D.
检查离子计是否使用
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反馈参考答案：
举一反三
【单选题】He felt that there __ something wrong about it.
A.
is
B.
have
C.
must be
D.
must have
【简答题】Beijing is becoming ______ and ______. A) beautiful, beautiful B) more, more beautiful C) more beautiful, more beautiful D) more beautiful, more
【简答题】He must have felt that shock of recognition in her . (Para. 2) He must have felt _____ in ______him.
【单选题】It is _______ it was yesterday.
A.
as beautiful day as
B.
as a beautiful day as
C.
as beautiful a day as
D.
beautiful as a day as
【简答题】西餐礼仪有哪些?(请至少写出五条)
【单选题】He failed in the driving test again. He _____. [ ]
A.
must have disappointed
B.
must have been disappointed
C.
might be disappointed
D.
couldn't be disappointed
【单选题】关于细菌的说法,以下错误的是()
A.
球菌在细胞分裂时形成的不同空间排列方式，可作为属种的分类依据。
B.
杆菌形态不稳定，常因培养时间、培养条件不同而有较大变化。
C.
细长的杆菌成为丝状菌，可引起水处理系统中的活性污泥丝状膨胀。
D.
细菌测定需经染色才能用显微镜观察，若采用负染色法，则标本会小于活菌体。
【单选题】Those who brig sunshine into the lives of others cannot keep from themselves.
A.
it
B.
one
C.
those
D.
them
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