月经血的主要特点是（）。 A.暗红色 B.不凝固 C.含子宫内膜碎片 D.宫颈黏液及

The mother of a 2-year-old child tells the nurse that her baby is using a potty seat but is still having problems toilet-training. Which of the following suggestions by the nurse would he most appropriate

A. Offer the child more praise each time.
B. Use a potty chair instead of a potty seat.
C. Focus on the "accidents" that occur during training.
D. Defer training until the child is developmentally ready.

选出错误的选项并改正。

( ) 1. Jenny has much dresses. 　　　　______________

　　　　　　　A　 B 　　C

( ) 2. I'm going to playing the guitar. 　　______________

　　　　A 　　　　　B 　 C

( ) 3. His family lives in a apartment. 　　______________

　　　　　　　　 A   B C

( ) 4. They go to the park in a sunny day.  ______________

 　　　　　　A 　　　　  B 　   C

( ) 5. Many flowers blooms in spring. 　  ______________

　　　　 A 　　　　　 B 　C

Icy roads and poor visibility are familiar hazards in the Midwest.

A．chances

B．dangers

C．conditions

D．occurrences

可行流满足的条件不包括（）。

A.网络中每条边上的流量在0与最大容量之间

B.中间点流入与流出量相等

C.任何点流量不可为零

D.发点流出量等于收点流入量

以扩大的分部分项工程为对象编制的定额是( )。

A．施工定额

B．预算定额

C．概算定额

D．概算指标