皮皮学，免费搜题
登录
搜题
【简答题】
使用Runnable接口方法创建两个线程th1,th2(分别用两个不同的实现类),在主函数类先启动th1,再启动th2,之后主函数执行一个循环输出“这是主线程的第i个循环”(i用循环次数还代替,循环10次)。重写th1线程run方法,方法内执行100个循环,每次循环输出“这是th1线程的第i个循环”,重写th2线程run方法,方法内执行100个循环,每次循环输出“这是th2线程的第i个循环”。 (1)输出结果截图,代码截图,说明结果原因。 (2)在th2的实现类的run方法的循环内加入sleep()方法,使其休眠100毫秒。观察结果,截图并说明原因。(注意:sleep方法需要加入try catch异常处理) (3)将th2的循环改为死循环,while(true)观察实验结果,并分析。若主线程出现死循环会如何。
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【简答题】PLC的主要工作过程的中心内容包括:
【多选题】How do retroviruses proliferate in host cells?
A.
Like retrotransposons, retroviruses use the enzyme reverse transcriptase to convert RNA into DN The enzyme is encoded by the retroviral genome, and a few molecules of the enzyme are packaged along with the RNA genome in each virus particle. When the single-stranded RNA genome of the retrovirus enters a cell, the reverse transcriptase brought in with it makes a complementary DNA strand to form a DNA/RNA hybrid double helix.
B.
The RNA strand is removed, and the reverse transcriptase (which can use either DNA or RNA as a template) now synthesizes a complementary DNA strand to produce a DNA double helix. This DNA is then inserted, or integrated, into a randomly selected site in the host genome by a virally encoded integrase enzyme. In this integrated state, the virus is latent: each time the host cell divides, it passes on a copy of the integrated viral genome, which is known as a provirus, to its progeny cells.
C.
The next step in the replication of a retrovirus—which can take place long after its integration into the host genome—is the copying of the integrated viral DNA into RNA by a host-cell RNA polymerase, which produces large numbers of single-stranded RNAs identical to the original infecting genome.
D.
These viral RNAs are then translated by the host-cell ribosomes to produce the viral shell proteins, the envelope proteins, and reverse transcriptase—all of which are assembled with the RNA genome into new virus particles.
【简答题】American researchers have developed a technique that may become an important tool in fighting virus from attacking its target-cells in the body's defense system．When virus enters the blood，i...
【简答题】Ⅰ.(1)某化学兴趣小组欲从下列装置中选取必要的装置制取（NH 4 ） 2 SO 4 溶液，连接的顺序（用接口序号字母表示）是：a 。 (2)将装置C中两种液体分离开的操作名称是__ _ __。装置D的作用是 。 Ⅱ.过氧化钙可以用于改善地表水质、处理含重金属粒子废水和治理赤潮，也可用于应急供氧等。工业上生产过氧化钙的主要流程如下： 已知 2 ·8H 2 O呈白色，微溶于水。I 2 +2S ...
【单选题】What occurs when a temperate phage enters a state called lysogeny? ( )
A.
Most viral genes are expressed
B.
The bacterial cell is lysed
C.
Many new viruses are produced
D.
Most normal bacterial functions are turned off.
E.
The virus may become integrated into the host genome.
相关题目：
参考解析：
知识点：
题目纠错 0
发布
