八达岭长城是万里长城上构筑最复杂、楼台最密集的地段。
A. 正确
B. 错误
“The engine not obtaining the sufficient speed for firing” means that ().
A. the start fails
B. the fuel pumps will be put into operation
C. the fuel valves are damaged
D. the combustion process will take over
退思园岁寒居宜于冬日赏景,透过居室花窗,可见潇洒清幽的腊梅,挺拔坚毅的苍松,清骨神秀的翠竹,天成一幅“()”。
成熟红细胞:有核细胞为20:1,有核细胞占1%~10%,骨髓的增生程度是()。
A. 极度活跃
B. 明显活跃
C. 活跃
D. 减低
E. 极度减低