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【单选题】
为数据表创建索引的目的是(_ _)A.
提高查询检索性能
B.
创建唯一索引
C.
为了建表方便
D.
为了归类
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【单选题】皮亚杰认为儿童公正观念或正义感得到发展,儿童的道德观念倾向于主持公正、平等,这个阶段儿童处于( )。
A.
“自我中心阶段”或前道德阶段
B.
“权威阶段”或他律道德阶段
C.
“可逆性阶段”或初步自律道德阶段
D.
“公正阶段”或自律道德阶段
【单选题】关于头肩顶形态，以下说法错误的是( )。
A.
头肩顶形态是一个可靠的沽出时机
B.
头肩顶形态是一种反转突破形态
C.
一般来说，左肩与右肩高点大致相等，有时右肩较左肩低，即颈线向下倾斜
D.
就成交量而言，左肩最小，头部次之，而右肩成交量最大，即呈梯状递增
【单选题】______ ,we should be glad.
A.
They arrive tomorrow
B.
Were they arriving tomorrow
C.
They were to arrive tomorrow
D.
Were they to arrive tomorrow
【单选题】_____ tomorrow, we should be glad.
A.
Were they to arrive
B.
They were to arrive
C.
They would arrive
D.
They arrive
【单选题】I’m glad to find that many trees ________ in our city last year.
A.
plant
B.
planted
C.
were planted
D.
are planted
【简答题】I’m glad we were able to meet.
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