According to David Yoffie and Michael Cusumano,______.
A. Jobs doesn"t accept the power of the platform. idea
B. Jobs" complicated attitude has no influence on his company
C. Apple may lose its leading position in the post-smartphone computing platform
D. Jobs doesn" t think platforms can benefit from network effects
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Apple Watch risks being hamstrung because it______.
A. is binded to the iPhone
B. has been given high expectations
C. needs to get its connectivity to the mobile phone
D. can be only obtained from Apple" s App store
【B3】
A. career
B. occupation
C. profession
D. vocation
关于2D-TOF与3D-TOF MRA的比较描述，错误的是
A. 2D-TOF流入饱和效应小，对慢流、血流方向一致的血管显示好;流动-静止对比好
B. 3D-TOF流人饱和效应明显，成像块厚受血管流速制约;信噪比好
C. 2D-TOF层面厚，空间分辨力差;相位弥散强，弯曲血管信号有丢失
D. 3D-TOF层厚较薄，空间分辨力髙;对复杂弯曲血管的信号丢失少
E. 相同容积2D-TOF较3D-TOF成像时间长
Suppose your friend Jack is addicted to online chatting. Write him an email to 1)tell
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