问题
单项选择题
Kevlar纤维()
A、由干喷湿纺法制成
B、轴向强度较径向强度低
C、强度性能可保持到1000℃以上
D、由化学沉积方法制成
答案
参考答案:A
Kevlar纤维()
A、由干喷湿纺法制成
B、轴向强度较径向强度低
C、强度性能可保持到1000℃以上
D、由化学沉积方法制成
参考答案:A
Tim was reading a book at office. Someone knocked on the door. He opened the door. 1 . "My name is Rebecca," said the lady. "You’ve got to help me!" "Take it easy." 2 "What happened?" "My grandma died last month. She left all her money, about $1,000,000 to me. She told me she had saved the money in a bank. 3 . " "But yesterday when I went to the bank, I only got an envelope with nothing in it. he money is gone!" Rebecca took the envelope out of her handbag and gave it to Tim. Tim looked at it carefully under the light. It was just an envelope with two old stamps on it. 4 “Don’t worry, Rebecca," he said. "Your money is still here.” |