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【单选题】
因为发现了人类能够从周围环境中获得必需的基因(生物学上称之“基因水平转移”),所以我们可以彻底否定达尔文的进化论。A.
是
B.
否
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举一反三
【单选题】On January 1, Fashion Forward Magazine received $15,000 from subscribers for the annual subscriptions that it recorded in Unearned Subscription Revenue. The issues of the magazine are mailed to subscr...
A.
$1,250.
B.
$3,750.
C.
$15,000.
D.
$7,500.
E.
$0.
【单选题】The first issue for the port is
A.
Depth of water
B.
Bridge clearance
C.
Crane
D.
Port operations
【单选题】在下列有关当前 PC 机主板和内存的叙述中,正确的是 _______
A.
主板上的 BIOS 芯片是一种只读存储器，其内容不可在线改写
B.
绝大多数主板上仅有一个内存插座
C.
内存条上的存储器芯片属于 SRAM
D.
目前内存的存取周期大多在十几个到几十几个 ns 之间
【单选题】设有关系模式R和S,下列各关系代数表达式不正确的是( )
A.
R - S = R - (R ∩ S)
B.
R = (R - S) ∪ (R ∩ S)
C.
R ∪ S = S - (S - R)
D.
R ∩ S = S - (R - S)
【单选题】Please allow 4 to 6 weeks after receipt of your payment for delivery of the first issue.
A.
It takes 4 or 6 weeks to receive your payment.
B.
You may get a magazine a month later.
C.
You will get a magazine every 4 to 6 weeks.
【单选题】The first issue for a port is
A.
Depth of water
B.
Bridge clearance
C.
Crane
D.
Port operations
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