On their first voyage, Zheng He and his men___________.
A. reached as far as the Philippines.
B. destroyed a lair of pirates and captured their leader
C. set up a base in Java
D. got their supplies from the locals and fishermen
查看答案
What is Zheng He’s main accomplishment?
A. He spread the glory of the Middle Kingdom.
B. He found trading partners in foreign countries.
C. He found a sea route to Africa.
D. He helped conquer unknown lands.
What can we conclude from the last paragraph?
A. Zheng He accomplished much more than any other explorers.
B. China benefited a lot from Zheng He’s seven voyages.
C. Zheng He was well remembered both at home and abroad.
D. The Yong Le emperor’s ambitions ended with Zheng He’s death.
分层叠加成形加工是增材制造的核心，包括模型截面轮廓的制作与截面轮廓的叠合。
A. 对
B. 错
3D打印技术之所以能够在多个行业得到广泛应用，原因是能够短时间内成形各种复杂形状的产品，而不需要特别的辅助工具。
A. 对
B. 错
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