X线钡剂检查呈跳跃征象者，提示为
A．肠系膜上动脉综合征B．肠结核C．肠伤寒D．溃疡性结肠炎E．阿米巴肠炎
参考答案：B
阅读，给照片按顺序标号。
Dear Linda,
Thank you for your pictures. Here are my pictures. In the first picture, I'm playing basketball at school. In
the second picture, I'm swimming. In the next picture, you can see my family at home. We are eating dinner. In
the last picture. I'm with my sister Gina. She's doing homework. I'm watching TV.
Date.
( ) ( ) ( ) ( )
直流电机倒拉反接制动中电枢电路串接附加电阻的大小与下降速度的关系是（）
A.附加电阻越大，下降速度越大
B.附加电阻越大，下降速度越小
C.附加电阻越小，下降速度越大
D.附加电阻越小，下降速度不变
