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【单选题】
A pair of synthetic gene circuits that count events — a long-stated goal for circuit engineers — was reported in _______. For one of these counter circuits, recombinase-mediated DNA rearrangement was used to create permanent memory of an event, and a similar strategy was later used to engineer a full set of recombinase-based logic gates.A.
2004
B.
2006
C.
2009
D.
2012
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知识点：
皮皮学刷刷变学霸
举一反三
【简答题】讨论函数 的连续性.
【多选题】下列说法错误的是
A.
循环语句中的break语句的作用就是跳出循环体，无论循环有多少层
B.
continue语句的作用就是继续执行循环体
C.
for和while都是当型循环，因此二者在任何情况下都可以相互等价转换
D.
穷举法求解问题的关键就是确定穷举对象、穷举范围以及符合答案的判定条件
【单选题】下列各组函数中，表示同一函数的是（ ）
A.
y= 3 x 5 与y= x 2
B.
y=lne x 与y=e lnx
C.
y= (x-1)(x+3) x-1 与y=x+3
D.
y=x 0 与y= 1 x 0
【简答题】成形工具包括( )( )( )
【单选题】Which of the following statements is NOT meant by the author，according to the second paragraphy
A.
Wood was the fuel of choice before coal．
B.
The use if coal is declining．
C.
Coal is the most environmentally unfriendly fuel next to oil．
D.
Coal reserves are plentiful and will be likely to become the major fuel of choice。
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