下面对自凝树脂的性能描述正确的是
A．脆性大
B．环境温度越高固化越快
C．残余单体量较多
D．一般在面团期塑形
E．颜色稳定性差
参考答案：B,C,E
小杰的爸爸是双眼皮，妈妈是单眼皮（双眼皮A对单眼皮a为显性），小杰是单眼皮．由此判断下面选项中不正确的是（ ）
A．单眼皮和双眼皮是一对相对性状
B．若该夫妇再生育一个孩子，该孩子是双眼皮的几率为50%
C．爸爸是双眼皮，小杰是单眼皮，这属于可遗传的变异
D．爸爸的基因型是AA，妈妈和小杰的基因型都是aa
Among the following statements, which is tree about sea horse().
A. The sea horse has a long snout that is not convenient for sucking.
B. Sea horses have no scales at all.
C. The sea horse is unable to grasp sea grass or coral.
D. Sea horse can move very fast over long distance.
