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What is the biggest problems they faced

【参考答案】

Not easy to persuade manufacturers to adopt the new design.
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A．He’s already completed the program.B．He doesn’t know the nurse’s phone number.C．He doesn’t have time to call.D．He’d like to get additional information.
A．He’s already completed the program.
B．He doesn’t know the nurse’s phone number.
C．He doesn’t have time to call.
D．He’d like to get additional information.
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