复制耐高温模型的琼脂印模材料中含量最高的成份是（）。
A.琼脂
B.高岭土
C.硼砂
D.水
E.甘油
参考答案：D
看图写单词。
1. Look, they're Nancy's ____________ , Jack's ____________ , Amy's
____________ and Mike's ____________ , Where are my ____________ ?
2. It's ____________ today. I can wear my new ____________ . I can
____________ , too.
用钨极氩弧焊焊接铝、镁等合金时，一般选用直流电源。（）
, Jack's ____________ 
, Amy's 
and Mike's ____________ 
, Where are my ____________ 
?
today. I can wear my new ____________ 
. I can
, too.