比如说今天sembcorp

Last done is 2.810, vol:6404 bid-v:12 bid-pice:3.020 sell-price:2.750 sell-v:5

但最后又正常了

Last done is 2.810, 6551 39 2.810 2.820 115

这段时间里，可以submit order，但是没有match，所以buy queue和sell queue可以overlap

最后sgx跑一个algorithm，定一个中间价。

sgx开盘收盘的algorithm:

http://info.sgx.com/SGXRuleb.nsf/VwCPForm_SGX_ST_RULES_Download/ST%20Rules%20Practice%20Note%2008.02.01.pdf/$File/ST%20Rules%20Practice%20Note%2008.02.01.pdf