【单选题】Which of the following conditions does the passage suggest is a possible cause for the failure of a lobster to develop a crusher claw?
A.
The loss of a claw during the third or earlier stage of development.
B.
The lose of claw during the fourth or fifth stage of development.
C.
The loss of a claw during the sixth stage of development.
D.
Development in an environment devoid of material that can be manipulated.
【单选题】动物发生转移性钙化时可以出现(2010真题上58)
【单选题】设于两种不同行车密度交界处的车站称之为( )
【单选题】加强黄土高原生态建设,改善环境的有效措施是()。
【单选题】下列哪项不是影响企业道德决策的因素( )
【单选题】关于突触传递特征的叙述,正确的是
A.
突触传递只能从突触前神经末梢传向突触后神经元
C.
在中枢神经系统内,只有兴奋可以发生总和,而抑制不会产生总和
D.
反射活动中,传入神经上的冲动频率往往与传出神经发出的冲动频率一致
【判断题】将下列各数按权展开,并计算十进制的值 (1) (2)