在影响儿童身心发育的因素中，对发育水平和发展速度提供可能性的因素是营养因素。( )
参考答案：错
解析： 正确答案是遗传因素。
电机的绝缘等级有哪几种？其最高极限耐受温度中多少？
Multipurpose Internet Mail Extension (MIME) is a (46) document messaging standard in the Internet enviroment, with MIME, users can send (47) Email messages that include audio, video, graph-ices, and text to any other user of a TCP/IP network. Richtext information can also be (48) into messages. It defines the fonts, formats, and (49) features of a document so the document can be easily (50) on many different types of systems.
（50）是（）
A.restored
B.redisplayed
C.stored
D.executed
