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【多选题】
以下进口商品，必须在卸货口岸实施检验的有（ )A.
旧机电产品
B.
大宗散装商品
C.
来自动植物疫区的商品
D.
易腐烂变质商品
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【多选题】Choose all of the true statements about good working/studying methods, procrastination and how to overcome procrastination.
A.
Keep a planner journal and keep track of the methods and techniques that work best for you.
B.
Make sure to put yourself in an environment with many distractions to help train yourself to overcome your procrastination urges.
C.
a task list is best done at night, right before you go to sleep. Research shows that this helps your zombies (subconscious processes) to process the list overnight, it easier to work on your tasks the next day.
D.
Pay attention for procrastination cues and remove yourself from environments that contain many distractions and procrastination cues.
【简答题】The following program consists of 3 concurrent processes and 3 binary semaphores. The semaphores are initialized as S0 = 1, S1 = 0, S2 = 0. Process P0
while(true)
{
wait(S0);
print '0';
re...
【简答题】【说明】 某公司欲开发一个管理选民信息的软件系统。系统的基本需求描述如下: (1)每个人(Person)可以是一个合法选民(Eligible)或者无效的选民(Ineligible)。 ( 2)每个合法选民必须通过该系统对其投票所在区域(即选区,Riding)进行注册( Registration)。每个合法选民仅能注册一个选区。 ( 3)选民所属选区由其居住地址(Address)决定。假设每个人只有...
【单选题】People have always been both fascinated by the spectacle of volcanic eruptions and terrified of their power.
A.
magic
B.
force
C.
display
D.
purpose
【简答题】The program follows to use a shared binary semaphore T. Process A
int Y;
A1: Y = X*2;
A2: X = Y;
signal(T);
Process B
int Z;
B1: wait(T);
B2: Z = X+1;
X = Z; T is...
【多选题】How do aromatic amino acids serve as precursors of many plant compounds?
A.
Phenylalanine, tyrosine, and tryptophan are converted to a variety of important compounds in plants.
B.
The rigid polymer lignin, derived from phenylalanine and tyrosine, is second only to cellulose in abundance in plant tissues. The structure of the lignin polymer is complex and not well understood.
C.
Tryptophan is also the precursor of the plant growth hormone indole-3-acetate, or auxin, which is important in the regulation of a wide range of biological processes in plants.
D.
Phenylalanine and tyrosine also give rise to many commercially significant natural products, including the tannins that inhibit oxidation in wines; alkaloids such as , which have potent physiological effects; and the flavoring of cinnamon oil, nutmeg, cloves, vanilla, cayenne pepper, and other products.
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