此贴可以关了。。。已得到官方邮件回复:
I presume that the temporary HK identity card that you mentioned is the Acknowledgement of Application for Identity Card.
You may wish to know that the acknowledgement form of application for an identity card (form no. ROP140 and ROP140A) are not acceptable for travel. Their holders are required to produce valid travel documents at Hong Kong immigration control points.